diff --git a/README.md b/README.md
index 80cdf31..c48c281 100755
--- a/README.md
+++ b/README.md
@@ -39,7 +39,12 @@ Or manually add it to your composer.json:
 
 ## Authentication
 
-The client ID and secret are the key and secret for your OAuth2 application found at the [Infusionsoft Developers](https://keys.developer.infusionsoft.com/apps/mykeys) website.
+Currently Keap supports two types of authentication for our APIs: the OAuth2 Access Code Grant and API Keys.  
+Developers of third-party integrations should always use our OAuth2 authentication, but developers building integrations for a single tenant may find the use of API Keys much simpler.
+
+### OAuth2 Access Code Grant
+
+The client ID and secret are the key and secret for your OAuth2 application found at the [Infusionsoft Developers](https://keys.developer.keap.com) website.
 
 ```php
 
@@ -75,6 +80,26 @@ if ($infusionsoft->getToken()) {
 }
 ```
 
+### API Keys
+
+API Keys are a "password" for your data in an application and should always be treated like a dangerous secret. 
+
+In our UI you will find an API Settings screen which divides API Keys into two distinct categories:
+* `Personal Access Tokens`, which are scoped to your own user account and can only see and manipulate the data you have access to.
+* `Service Account Keys`, which can only be authorized by an Administrator and have full access to the data stored in the application.
+
+For additional information on how to authorize and use PATs and SAKs please see our [developer documentation](https://developer.infusionsoft.com/pat-and-sak/).
+
+```php
+require_once 'vendor/autoload.php';
+
+$infusionsoft = new \Infusionsoft\Infusionsoft(array(
+  'apikey' => $APIKeyRetrievedFromCredentialStorage,
+));
+
+// MAKE INFUSIONSOFT REQUEST
+```
+
 ## Making XML-RPC Requests
 
 ```php
diff --git a/composer.json b/composer.json
index f845a23..caf9445 100755
--- a/composer.json
+++ b/composer.json
@@ -14,13 +14,15 @@
         }
     ],
     "require": {
-        "php": ">=7.3",
+        "php": ">=8.1",
         "guzzlehttp/guzzle": "^7.4.2",
-        "lstrojny/fxmlrpc": "^0.20.0",
+        "lstrojny/fxmlrpc": "^0.22.0",
         "psr/log": "^1.0|^2.0|^3.0",
-        "laminas/laminas-diactoros": "^2.18.1",
+        "laminas/laminas-diactoros": "^2.26.0",
         "php-http/guzzle7-adapter": "^1.0",
-        "php-http/message": "^1.6"
+        "php-http/message": "^1.16",
+        "psr/http-factory": "^1.0",
+        "php-http/message-factory": "^1.1"
     },
     "require-dev": {
         "mockery/mockery": "^1.2",
diff --git a/composer.lock b/composer.lock
index dac27fa..3f31778 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,27 +4,27 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "7f680c2eb1e7084758097f0acf706662",
+    "content-hash": "091ca94a15d88f42acd38adc114f8fb1",
     "packages": [
         {
             "name": "clue/stream-filter",
-            "version": "v1.6.0",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/clue/stream-filter.git",
-                "reference": "d6169430c7731d8509da7aecd0af756a5747b78e"
+                "reference": "049509fef80032cb3f051595029ab75b49a3c2f7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/clue/stream-filter/zipball/d6169430c7731d8509da7aecd0af756a5747b78e",
-                "reference": "d6169430c7731d8509da7aecd0af756a5747b78e",
+                "url": "https://api.github.com/repos/clue/stream-filter/zipball/049509fef80032cb3f051595029ab75b49a3c2f7",
+                "reference": "049509fef80032cb3f051595029ab75b49a3c2f7",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.36"
+                "phpunit/phpunit": "^9.6 || ^5.7 || ^4.8.36"
             },
             "type": "library",
             "autoload": {
@@ -46,7 +46,7 @@
                 }
             ],
             "description": "A simple and modern approach to stream filtering in PHP",
-            "homepage": "https://github.com/clue/php-stream-filter",
+            "homepage": "https://github.com/clue/stream-filter",
             "keywords": [
                 "bucket brigade",
                 "callback",
@@ -58,7 +58,7 @@
             ],
             "support": {
                 "issues": "https://github.com/clue/stream-filter/issues",
-                "source": "https://github.com/clue/stream-filter/tree/v1.6.0"
+                "source": "https://github.com/clue/stream-filter/tree/v1.7.0"
             },
             "funding": [
                 {
@@ -70,26 +70,26 @@
                     "type": "github"
                 }
             ],
-            "time": "2022-02-21T13:15:14+00:00"
+            "time": "2023-12-20T15:40:13+00:00"
         },
         {
             "name": "guzzlehttp/guzzle",
-            "version": "7.7.0",
+            "version": "7.8.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "fb7566caccf22d74d1ab270de3551f72a58399f5"
+                "reference": "41042bc7ab002487b876a0683fc8dce04ddce104"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/fb7566caccf22d74d1ab270de3551f72a58399f5",
-                "reference": "fb7566caccf22d74d1ab270de3551f72a58399f5",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/41042bc7ab002487b876a0683fc8dce04ddce104",
+                "reference": "41042bc7ab002487b876a0683fc8dce04ddce104",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
-                "guzzlehttp/promises": "^1.5.3 || ^2.0",
-                "guzzlehttp/psr7": "^1.9.1 || ^2.4.5",
+                "guzzlehttp/promises": "^1.5.3 || ^2.0.1",
+                "guzzlehttp/psr7": "^1.9.1 || ^2.5.1",
                 "php": "^7.2.5 || ^8.0",
                 "psr/http-client": "^1.0",
                 "symfony/deprecation-contracts": "^2.2 || ^3.0"
@@ -98,11 +98,11 @@
                 "psr/http-client-implementation": "1.0"
             },
             "require-dev": {
-                "bamarni/composer-bin-plugin": "^1.8.1",
+                "bamarni/composer-bin-plugin": "^1.8.2",
                 "ext-curl": "*",
                 "php-http/client-integration-tests": "dev-master#2c025848417c1135031fdf9c728ee53d0a7ceaee as 3.0.999",
                 "php-http/message-factory": "^1.1",
-                "phpunit/phpunit": "^8.5.29 || ^9.5.23",
+                "phpunit/phpunit": "^8.5.36 || ^9.6.15",
                 "psr/log": "^1.1 || ^2.0 || ^3.0"
             },
             "suggest": {
@@ -180,7 +180,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/guzzle/issues",
-                "source": "https://github.com/guzzle/guzzle/tree/7.7.0"
+                "source": "https://github.com/guzzle/guzzle/tree/7.8.1"
             },
             "funding": [
                 {
@@ -196,28 +196,28 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-05-21T14:04:53+00:00"
+            "time": "2023-12-03T20:35:24+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "2.0.0",
+            "version": "2.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "3a494dc7dc1d7d12e511890177ae2d0e6c107da6"
+                "reference": "bbff78d96034045e58e13dedd6ad91b5d1253223"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/promises/zipball/3a494dc7dc1d7d12e511890177ae2d0e6c107da6",
-                "reference": "3a494dc7dc1d7d12e511890177ae2d0e6c107da6",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/bbff78d96034045e58e13dedd6ad91b5d1253223",
+                "reference": "bbff78d96034045e58e13dedd6ad91b5d1253223",
                 "shasum": ""
             },
             "require": {
                 "php": "^7.2.5 || ^8.0"
             },
             "require-dev": {
-                "bamarni/composer-bin-plugin": "^1.8.1",
-                "phpunit/phpunit": "^8.5.29 || ^9.5.23"
+                "bamarni/composer-bin-plugin": "^1.8.2",
+                "phpunit/phpunit": "^8.5.36 || ^9.6.15"
             },
             "type": "library",
             "extra": {
@@ -263,7 +263,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/promises/issues",
-                "source": "https://github.com/guzzle/promises/tree/2.0.0"
+                "source": "https://github.com/guzzle/promises/tree/2.0.2"
             },
             "funding": [
                 {
@@ -279,20 +279,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-05-21T13:50:22+00:00"
+            "time": "2023-12-03T20:19:20+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "2.5.0",
+            "version": "2.6.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "b635f279edd83fc275f822a1188157ffea568ff6"
+                "reference": "45b30f99ac27b5ca93cb4831afe16285f57b8221"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/b635f279edd83fc275f822a1188157ffea568ff6",
-                "reference": "b635f279edd83fc275f822a1188157ffea568ff6",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/45b30f99ac27b5ca93cb4831afe16285f57b8221",
+                "reference": "45b30f99ac27b5ca93cb4831afe16285f57b8221",
                 "shasum": ""
             },
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@@ -306,9 +306,9 @@
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "bamarni/composer-bin-plugin": "^1.8.1",
+                "bamarni/composer-bin-plugin": "^1.8.2",
                 "http-interop/http-factory-tests": "^0.9",
-                "phpunit/phpunit": "^8.5.29 || ^9.5.23"
+                "phpunit/phpunit": "^8.5.36 || ^9.6.15"
             },
             "suggest": {
                 "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
@@ -379,7 +379,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/psr7/issues",
-                "source": "https://github.com/guzzle/psr7/tree/2.5.0"
+                "source": "https://github.com/guzzle/psr7/tree/2.6.2"
             },
             "funding": [
                 {
@@ -395,24 +395,24 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-04-17T16:11:26+00:00"
+            "time": "2023-12-03T20:05:35+00:00"
         },
         {
             "name": "laminas/laminas-diactoros",
-            "version": "2.25.2",
+            "version": "2.26.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laminas/laminas-diactoros.git",
-                "reference": "9f3f4bf5b99c9538b6f1dbcc20f6fec357914f9e"
+                "reference": "6584d44eb8e477e89d453313b858daac6183cddc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laminas/laminas-diactoros/zipball/9f3f4bf5b99c9538b6f1dbcc20f6fec357914f9e",
-                "reference": "9f3f4bf5b99c9538b6f1dbcc20f6fec357914f9e",
+                "url": "https://api.github.com/repos/laminas/laminas-diactoros/zipball/6584d44eb8e477e89d453313b858daac6183cddc",
+                "reference": "6584d44eb8e477e89d453313b858daac6183cddc",
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             },
             "require": {
-                "php": "~8.0.0 || ~8.1.0 || ~8.2.0",
+                "php": "~8.0.0 || ~8.1.0 || ~8.2.0 || ~8.3.0",
                 "psr/http-factory": "^1.0",
                 "psr/http-message": "^1.1"
             },
@@ -492,20 +492,20 @@
                     "type": "community_bridge"
                 }
             ],
-            "time": "2023-04-17T15:44:17+00:00"
+            "time": "2023-10-29T16:17:44+00:00"
         },
         {
             "name": "lstrojny/fxmlrpc",
-            "version": "0.20.0",
+            "version": "0.22.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/lstrojny/fxmlrpc.git",
-                "reference": "c84c39583db75bf639155c20e7d5704e1d47596b"
+                "reference": "866ae7835beb0d0e36ec2ae183fb86f4dafd1b34"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/lstrojny/fxmlrpc/zipball/c84c39583db75bf639155c20e7d5704e1d47596b",
-                "reference": "c84c39583db75bf639155c20e7d5704e1d47596b",
+                "url": "https://api.github.com/repos/lstrojny/fxmlrpc/zipball/866ae7835beb0d0e36ec2ae183fb86f4dafd1b34",
+                "reference": "866ae7835beb0d0e36ec2ae183fb86f4dafd1b34",
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             "require": {
@@ -569,22 +569,22 @@
             ],
             "support": {
                 "issues": "https://github.com/lstrojny/fxmlrpc/issues",
-                "source": "https://github.com/lstrojny/fxmlrpc/tree/0.20.0"
+                "source": "https://github.com/lstrojny/fxmlrpc/tree/0.22.0"
             },
-            "time": "2021-05-21T15:11:33+00:00"
+            "time": "2021-06-21T09:30:29+00:00"
         },
         {
             "name": "php-http/discovery",
-            "version": "1.19.1",
+            "version": "1.19.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-http/discovery.git",
-                "reference": "57f3de01d32085fea20865f9b16fb0e69347c39e"
+                "reference": "61e1a1eb69c92741f5896d9e05fb8e9d7e8bb0cb"
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-                "reference": "57f3de01d32085fea20865f9b16fb0e69347c39e",
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+                "reference": "61e1a1eb69c92741f5896d9e05fb8e9d7e8bb0cb",
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@@ -647,9 +647,9 @@
             ],
             "support": {
                 "issues": "https://github.com/php-http/discovery/issues",
-                "source": "https://github.com/php-http/discovery/tree/1.19.1"
+                "source": "https://github.com/php-http/discovery/tree/1.19.2"
             },
-            "time": "2023-07-11T07:02:26+00:00"
+            "time": "2023-11-30T16:49:05+00:00"
         },
         {
             "name": "php-http/guzzle7-adapter",
@@ -772,16 +772,16 @@
         },
         {
             "name": "php-http/message",
-            "version": "1.16.0",
+            "version": "1.16.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-http/message.git",
-                "reference": "47a14338bf4ebd67d317bf1144253d7db4ab55fd"
+                "reference": "5997f3289332c699fa2545c427826272498a2088"
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-                "reference": "47a14338bf4ebd67d317bf1144253d7db4ab55fd",
+                "url": "https://api.github.com/repos/php-http/message/zipball/5997f3289332c699fa2545c427826272498a2088",
+                "reference": "5997f3289332c699fa2545c427826272498a2088",
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@@ -835,37 +835,87 @@
             ],
             "support": {
                 "issues": "https://github.com/php-http/message/issues",
-                "source": "https://github.com/php-http/message/tree/1.16.0"
+                "source": "https://github.com/php-http/message/tree/1.16.1"
             },
-            "time": "2023-05-17T06:43:38+00:00"
+            "time": "2024-03-07T13:22:09+00:00"
         },
         {
-            "name": "php-http/promise",
+            "name": "php-http/message-factory",
             "version": "1.1.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-http/promise.git",
-                "reference": "4c4c1f9b7289a2ec57cde7f1e9762a5789506f88"
+                "url": "https://github.com/php-http/message-factory.git",
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-                "reference": "4c4c1f9b7289a2ec57cde7f1e9762a5789506f88",
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-                "friends-of-phpspec/phpspec-code-coverage": "^4.3.2",
-                "phpspec/phpspec": "^5.1.2 || ^6.2"
+                "php": ">=5.4",
+                "psr/http-message": "^1.0 || ^2.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.1-dev"
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Http\\Message\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com"
                 }
+            ],
+            "description": "Factory interfaces for PSR-7 HTTP Message",
+            "homepage": "http://php-http.org",
+            "keywords": [
+                "factory",
+                "http",
+                "message",
+                "stream",
+                "uri"
+            ],
+            "support": {
+                "issues": "https://github.com/php-http/message-factory/issues",
+                "source": "https://github.com/php-http/message-factory/tree/1.1.0"
+            },
+            "abandoned": "psr/http-factory",
+            "time": "2023-04-14T14:16:17+00:00"
+        },
+        {
+            "name": "php-http/promise",
+            "version": "1.3.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/php-http/promise.git",
+                "reference": "fc85b1fba37c169a69a07ef0d5a8075770cc1f83"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/php-http/promise/zipball/fc85b1fba37c169a69a07ef0d5a8075770cc1f83",
+                "reference": "fc85b1fba37c169a69a07ef0d5a8075770cc1f83",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
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+                "phpspec/phpspec": "^5.1.2 || ^6.2 || ^7.4"
             },
+            "type": "library",
             "autoload": {
                 "psr-4": {
                     "Http\\Promise\\": "src/"
@@ -892,22 +942,22 @@
             ],
             "support": {
                 "issues": "https://github.com/php-http/promise/issues",
-                "source": "https://github.com/php-http/promise/tree/1.1.0"
+                "source": "https://github.com/php-http/promise/tree/1.3.1"
             },
-            "time": "2020-07-07T09:29:14+00:00"
+            "time": "2024-03-15T13:55:21+00:00"
         },
         {
             "name": "psr/http-client",
-            "version": "1.0.2",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/http-client.git",
-                "reference": "0955afe48220520692d2d09f7ab7e0f93ffd6a31"
+                "reference": "bb5906edc1c324c9a05aa0873d40117941e5fa90"
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             ],
-            "time": "2020-11-28T06:42:11+00:00"
+            "time": "2023-12-22T06:20:34+00:00"
         },
         {
             "name": "sebastian/object-enumerator",
@@ -2874,16 +2932,16 @@
         },
         {
             "name": "sebastian/resource-operations",
-            "version": "3.0.3",
+            "version": "3.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/resource-operations.git",
-                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8"
+                "reference": "05d5692a7993ecccd56a03e40cd7e5b09b1d404e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
-                "reference": "0f4443cb3a1d92ce809899753bc0d5d5a8dd19a8",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/05d5692a7993ecccd56a03e40cd7e5b09b1d404e",
+                "reference": "05d5692a7993ecccd56a03e40cd7e5b09b1d404e",
                 "shasum": ""
             },
             "require": {
@@ -2895,7 +2953,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.0-dev"
+                    "dev-main": "3.0-dev"
                 }
             },
             "autoload": {
@@ -2916,8 +2974,7 @@
             "description": "Provides a list of PHP built-in functions that operate on resources",
             "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
             "support": {
-                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
-                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.3"
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/3.0.4"
             },
             "funding": [
                 {
@@ -2925,7 +2982,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-09-28T06:45:17+00:00"
+            "time": "2024-03-14T16:00:52+00:00"
         },
         {
             "name": "sebastian/type",
@@ -3038,16 +3095,16 @@
         },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.7.2",
+            "version": "3.9.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/squizlabs/PHP_CodeSniffer.git",
-                "reference": "ed8e00df0a83aa96acf703f8c2979ff33341f879"
+                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer.git",
+                "reference": "d63cee4890a8afaf86a22e51ad4d97c91dd4579b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/squizlabs/PHP_CodeSniffer/zipball/ed8e00df0a83aa96acf703f8c2979ff33341f879",
-                "reference": "ed8e00df0a83aa96acf703f8c2979ff33341f879",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/d63cee4890a8afaf86a22e51ad4d97c91dd4579b",
+                "reference": "d63cee4890a8afaf86a22e51ad4d97c91dd4579b",
                 "shasum": ""
             },
             "require": {
@@ -3057,11 +3114,11 @@
                 "php": ">=5.4.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0"
+                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.3.4"
             },
             "bin": [
-                "bin/phpcs",
-                "bin/phpcbf"
+                "bin/phpcbf",
+                "bin/phpcs"
             ],
             "type": "library",
             "extra": {
@@ -3076,35 +3133,58 @@
             "authors": [
                 {
                     "name": "Greg Sherwood",
-                    "role": "lead"
+                    "role": "Former lead"
+                },
+                {
+                    "name": "Juliette Reinders Folmer",
+                    "role": "Current lead"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/PHPCSStandards/PHP_CodeSniffer/graphs/contributors"
                 }
             ],
             "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
-            "homepage": "https://github.com/squizlabs/PHP_CodeSniffer",
+            "homepage": "https://github.com/PHPCSStandards/PHP_CodeSniffer",
             "keywords": [
                 "phpcs",
                 "standards",
                 "static analysis"
             ],
             "support": {
-                "issues": "https://github.com/squizlabs/PHP_CodeSniffer/issues",
-                "source": "https://github.com/squizlabs/PHP_CodeSniffer",
-                "wiki": "https://github.com/squizlabs/PHP_CodeSniffer/wiki"
+                "issues": "https://github.com/PHPCSStandards/PHP_CodeSniffer/issues",
+                "security": "https://github.com/PHPCSStandards/PHP_CodeSniffer/security/policy",
+                "source": "https://github.com/PHPCSStandards/PHP_CodeSniffer",
+                "wiki": "https://github.com/PHPCSStandards/PHP_CodeSniffer/wiki"
             },
-            "time": "2023-02-22T23:07:41+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCSStandards",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2024-02-16T15:06:51+00:00"
         },
         {
             "name": "theseer/tokenizer",
-            "version": "1.2.1",
+            "version": "1.2.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/theseer/tokenizer.git",
-                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e"
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/34a41e998c2183e22995f158c581e7b5e755ab9e",
-                "reference": "34a41e998c2183e22995f158c581e7b5e755ab9e",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
+                "reference": "737eda637ed5e28c3413cb1ebe8bb52cbf1ca7a2",
                 "shasum": ""
             },
             "require": {
@@ -3133,7 +3213,7 @@
             "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
             "support": {
                 "issues": "https://github.com/theseer/tokenizer/issues",
-                "source": "https://github.com/theseer/tokenizer/tree/1.2.1"
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.3"
             },
             "funding": [
                 {
@@ -3141,7 +3221,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-07-28T10:34:58+00:00"
+            "time": "2024-03-03T12:36:25+00:00"
         }
     ],
     "aliases": [],
@@ -3150,7 +3230,7 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": ">=7.3"
+        "php": ">=8.1"
     },
     "platform-dev": [],
     "plugin-api-version": "2.3.0"
diff --git a/src/Infusionsoft/AuthenticationType.php b/src/Infusionsoft/AuthenticationType.php
new file mode 100644
index 0000000..3730438
--- /dev/null
+++ b/src/Infusionsoft/AuthenticationType.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Infusionsoft;
+
+enum AuthenticationType {
+    case OAuth2AccessToken;
+    case LegacyKey;
+    case ServiceAccountKey;
+}
diff --git a/src/Infusionsoft/Http/ClientInterface.php b/src/Infusionsoft/Http/ClientInterface.php
index 4925bbe..a8a08ab 100644
--- a/src/Infusionsoft/Http/ClientInterface.php
+++ b/src/Infusionsoft/Http/ClientInterface.php
@@ -7,7 +7,7 @@ interface ClientInterface {
 	/**
 	 * @return \fXmlRpc\Transport\TransportInterface
 	 */
-	public function getXmlRpcTransport();
+	public function getXmlRpcTransport($options);
 
 	/**
 	 * Sends a request to the given URI and returns the raw response.
diff --git a/src/Infusionsoft/Http/GuzzleHttpClient.php b/src/Infusionsoft/Http/GuzzleHttpClient.php
index a3e9564..437d3f9 100644
--- a/src/Infusionsoft/Http/GuzzleHttpClient.php
+++ b/src/Infusionsoft/Http/GuzzleHttpClient.php
@@ -18,12 +18,16 @@ class GuzzleHttpClient extends Client implements ClientInterface
     public $debug;
     public $httpLogAdapter;
 
-    public function __construct($debug, LoggerInterface $httpLogAdapter)
+    public function __construct($debug, LoggerInterface $httpLogAdapter, $options = null)
     {
         $this->debug          = $debug;
         $this->httpLogAdapter = $httpLogAdapter;
 
-        $config = ['timeout' => 60];
+        $config = [];
+        if(isset($options)) {
+            $config = $options;
+        }
+        $config['timeout'] = 60;
         if ($this->debug) {
             $config['handler'] = HandlerStack::create();
             $config['handler']->push(
@@ -37,13 +41,16 @@ public function __construct($debug, LoggerInterface $httpLogAdapter)
     /**
      * @return \fXmlRpc\Transport\TransportInterface
      */
-    public function getXmlRpcTransport()
+    public function getXmlRpcTransport($options = null)
     {
 
         $adapter = new \Http\Adapter\Guzzle7\Client($this);
 
-        return new HttpAdapterTransport(new \Http\Message\MessageFactory\DiactorosMessageFactory(),
-            $adapter);
+        return new InfusionsoftHttpAdapterTransport(
+            new \Http\Message\MessageFactory\DiactorosMessageFactory(),
+            $adapter,
+            $options
+        );
     }
 
     /**
diff --git a/src/Infusionsoft/Http/InfusionsoftHttpAdapterTransport.php b/src/Infusionsoft/Http/InfusionsoftHttpAdapterTransport.php
new file mode 100644
index 0000000..21bf1e5
--- /dev/null
+++ b/src/Infusionsoft/Http/InfusionsoftHttpAdapterTransport.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace Infusionsoft\Http;
+
+use fXmlRpc\Exception\HttpException;
+use fXmlRpc\Exception\TransportException;
+use fXmlRpc\Transport\TransportInterface;
+use Http\Client\Exception as ClientException;
+use Http\Client\Exception\HttpException as PsrHttpException;
+use Http\Message\MessageFactory;
+use Psr\Http\Client\ClientInterface;
+
+class InfusionsoftHttpAdapterTransport implements TransportInterface
+{
+
+    private $messageFactory;
+
+    private $client;
+
+    private $defaultOptions;
+
+    public function __construct(MessageFactory $messageFactory, ClientInterface $client, array $options = null)
+    {
+        $this->client = $client;
+        $this->messageFactory = $messageFactory;
+        $this->defaultOptions = $options;
+    }
+
+    /**
+     * @param $endpoint
+     * @param $payload
+     * @return string
+     * @throws \Psr\Http\Client\ClientExceptionInterface
+     */
+    public function send($endpoint, $payload)
+    {
+        $headers = [];
+        if(isset($this->defaultOptions['headers'])) {
+            $headers = $this->defaultOptions['headers'];
+        }
+        $headers['Content-Type'] = 'text/xml; charset=UTF-8';
+
+        try {
+            $request = $this->messageFactory->createRequest(
+                'POST',
+                $endpoint,
+                $headers,
+                $payload
+            );
+
+            $response = $this->client->sendRequest($request);
+            if ($response->getStatusCode() !== 200) {
+                throw HttpException::httpError($response->getReasonPhrase(), $response->getStatusCode());
+            }
+
+            return (string) $response->getBody();
+
+        } catch (PsrHttpException $e) {
+            $response = $e->getResponse();
+            throw HttpException::httpError($response->getReasonPhrase(), $response->getStatusCode());
+        } catch (ClientException $e) {
+            throw TransportException::transportError($e);
+        }
+    }
+
+}
diff --git a/src/Infusionsoft/Infusionsoft.php b/src/Infusionsoft/Infusionsoft.php
index 80f4050..a55a59a 100644
--- a/src/Infusionsoft/Infusionsoft.php
+++ b/src/Infusionsoft/Infusionsoft.php
@@ -2,9 +2,11 @@
 
 namespace Infusionsoft;
 
+use Infusionsoft\AuthenticationType;
 use Infusionsoft\Http\ArrayLogger;
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
+use function PHPUnit\Framework\throwException;
 
 class Infusionsoft
 {
@@ -44,6 +46,11 @@ class Infusionsoft
      */
     protected $redirectUri;
 
+    /**
+     * @var string
+     */
+    protected $apikey;
+
     /**
      * @var array Cache for services so they aren't created multiple times
      */
@@ -79,6 +86,11 @@ class Infusionsoft
      */
     protected $token;
 
+    /**
+     * @var AuthenticationType
+     */
+    protected $authenticationType;
+
     /**
      * @param array $config
      */
@@ -92,6 +104,20 @@ public function __construct($config = array())
             $this->clientSecret = $config['clientSecret'];
         }
 
+        if (isset($config['clientId']) && isset($config['clientSecret'])) {
+            $this->authenticationType = AuthenticationType::OAuth2AccessToken;
+        } else if (isset($config['apikey'])) {
+            $this->apikey = $config['apikey'];
+
+            if ( substr_compare($this->apikey, 'KeapAK', 0, strlen('KeapAK') ) ) {
+                $this->authenticationType = AuthenticationType::ServiceAccountKey;
+            } else {
+                $this->authenticationType = AuthenticationType::LegacyKey;
+            }
+        } else {
+            throw new Exception('Constructor needs either a clientId & clientSecret or an apikey');
+        }
+
         if (isset($config['redirectUri'])) {
             $this->redirectUri = $config['redirectUri'];
         }
@@ -112,7 +138,7 @@ public function getUrl()
     /**
      * @param string $url
      *
-     * @return string
+     * @return Infusionsoft
      */
     public function setUrl($url)
     {
@@ -130,9 +156,9 @@ public function getBaseUrl()
     }
 
     /**
-     * @param $url
+     * @param string
      *
-     * @return $this
+     * @return Infusionsoft
      */
     public function setBaseUrl($url)
     {
@@ -152,7 +178,7 @@ public function getAuth()
     /**
      * @param string $auth
      *
-     * @return string
+     * @return Infusionsoft
      */
     public function setAuth($auth)
     {
@@ -188,7 +214,7 @@ public function getClientId()
     /**
      * @param string $clientId
      *
-     * @return string
+     * @return Infusionsoft
      */
     public function setClientId($clientId)
     {
@@ -208,7 +234,7 @@ public function getClientSecret()
     /**
      * @param string $clientSecret
      *
-     * @return string
+     * @return Infusionsoft
      */
     public function setClientSecret($clientSecret)
     {
@@ -228,7 +254,7 @@ public function getRedirectUri()
     /**
      * @param string $redirectUri
      *
-     * @return string
+     * @return Infusionsoft
      */
     public function setRedirectUri($redirectUri)
     {
@@ -256,6 +282,22 @@ public function getAuthorizationUrl($state = null)
         return $this->auth . '?' . http_build_query($params);
     }
 
+    /**
+     * @return Infusionsoft
+     */
+    public function setApiKey($apikey) {
+        $this->apikey = $apikey;
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getApiKey() {
+        return $this->apikey;
+    }
+
     /**
      * @param string $code
      *
@@ -287,10 +329,10 @@ public function requestAccessToken($code)
     /**
      * @return Http\ClientInterface
      */
-    public function getHttpClient()
+    public function getHttpClient($options = null)
     {
         if ( ! $this->httpClient) {
-            return new Http\GuzzleHttpClient($this->debug, $this->getHttpLogAdapter());
+            return new Http\GuzzleHttpClient($this->debug, $this->getHttpLogAdapter(), $options);
         }
 
         return $this->httpClient;
@@ -433,12 +475,10 @@ public function request()
         // Before making the request, we can make sure that the token is still
         // valid by doing a check on the end of life.
         $token = $this->getToken();
-        if ($this->isTokenExpired()) {
+        if ($this->authenticationType === AuthenticationType::OAuth2AccessToken && $this->isTokenExpired()) {
             throw new TokenExpiredException;
         }
 
-        $url = $this->url . '?' . http_build_query(array('access_token' => $token->getAccessToken()));
-
         $params = func_get_args();
         $method = array_shift($params);
 
@@ -446,16 +486,17 @@ public function request()
         // even if OAuth is being used. This flag can be made false as it
         // will break some newer endpoints.
         if ($this->needsEmptyKey) {
-            $params = array_merge(array('key' => $token->getAccessToken()), $params);
+            $params = array_merge(array('key' => 'backwards-compatability'), $params);
         }
 
         // Reset the empty key flag back to the default for the next request
         $this->needsEmptyKey = true;
 
-        $client   = $this->getSerializer();
-        $response = $client->request($method, $url, $params, $this->getHttpClient());
+        $options = $this->setOptionsForRequest([]);
+
+        $client = $this->getSerializer();
 
-        return $response;
+        return $client->request($method, $this->getUrl(), $params, $this->getHttpClient($options));
     }
 
     /**
@@ -471,26 +512,22 @@ public function restfulRequest($method, $url, $params = array())
         // Before making the request, we can make sure that the token is still
         // valid by doing a check on the end of life.
         $token = $this->getToken();
-        if ($this->isTokenExpired()) {
+        if ($this->authenticationType === AuthenticationType::OAuth2AccessToken && $this->isTokenExpired()) {
             throw new TokenExpiredException;
         }
 
         $client      = $this->getHttpClient();
-        $full_params = [];
+        $params = [];
 
         if (strtolower($method) === 'get' || strtolower($method) === 'delete') {
-            $params = array_merge(array('access_token' => $token->getAccessToken()), $params);
             $url    = $url . '?' . http_build_query($params);
         } else {
-            $url                 = $url . '?' . http_build_query(array('access_token' => $token->getAccessToken()));
-            $full_params['body'] = json_encode($params);
+            $params['body'] = json_encode($params);
         }
 
-        $full_params['headers'] = array(
-            'Content-Type' => 'application/json',
-        );
+        $params = $this->setOptionsForRequest($params);
 
-        $response = (string)$client->call($method, $url, $full_params);
+        $response = (string)$client->call($method, $url, $params);
 
         return json_decode($response, true);
     }
@@ -853,5 +890,25 @@ public function getRestApi($class)
         return new $class($this);
     }
 
+    /**
+     * @param array $options
+     * @return array
+     */
+    public function setOptionsForRequest(array $options): array
+    {
+        if ($this->authenticationType === AuthenticationType::OAuth2AccessToken) {
+            $options['headers'] = array(
+                'Content-Type' => 'application/json',
+                'Authorization' => 'Bearer ' . $this->getToken()->getAccessToken()
+            );
+        } else {
+            $options['headers'] = array(
+                'Content-Type' => 'application/json',
+                'X-Keap-API-Key' => $this->apikey
+            );
+        }
+        return $options;
+    }
+
 }