Add php code snippets to api reference

src/api/preauthorization/capture/index.php

@@ -0,0 +1,30 @@
+<?php
+  $url = "https://api.paystack.co/preauthorization/capture";
+
+  $fields = [
+    'reference' => '123-abc'
+    'currency' => 'ZAR'
+    'amount' => '10000'
+  ];
+
+  $fields_string = http_build_query($fields);
+
+  //open connection
+  $ch = curl_init();
+
+  //set the url, number of POST vars, POST data
+  curl_setopt($ch,CURLOPT_URL, $url);
+  curl_setopt($ch,CURLOPT_POST, true);
+  curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
+  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+    "Authorization: Bearer SECRET_KEY",
+    "Cache-Control: no-cache",
+  ));
+
+  //So that curl_exec returns the contents of the cURL; rather than echoing it
+  curl_setopt($ch,CURLOPT_RETURNTRANSFER, true); 
+
+  //execute post
+  $result = curl_exec($ch);
+  echo $result;
+?>

src/api/preauthorization/initialize/index.php

@@ -0,0 +1,30 @@
+<?php
+  $url = "https://api.paystack.co/preauthorization/initialize";
+
+  $fields = [
+    'reference' => '123-abc'
+    'currency' => 'ZAR'
+    'amount' => '10000'
+  ];
+
+  $fields_string = http_build_query($fields);
+
+  //open connection
+  $ch = curl_init();
+
+  //set the url, number of POST vars, POST data
+  curl_setopt($ch,CURLOPT_URL, $url);
+  curl_setopt($ch,CURLOPT_POST, true);
+  curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
+  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+    "Authorization: Bearer SECRET_KEY",
+    "Cache-Control: no-cache",
+  ));
+
+  //So that curl_exec returns the contents of the cURL; rather than echoing it
+  curl_setopt($ch,CURLOPT_RETURNTRANSFER, true); 
+
+  //execute post
+  $result = curl_exec($ch);
+  echo $result;
+?>

src/api/preauthorization/release/index.php

@@ -0,0 +1,28 @@
+<?php
+  $url = "https://api.paystack.co/preauthorization/release";
+
+  $fields = [
+    'reference' => '123-abc'
+  ];
+
+  $fields_string = http_build_query($fields);
+
+  //open connection
+  $ch = curl_init();
+
+  //set the url, number of POST vars, POST data
+  curl_setopt($ch,CURLOPT_URL, $url);
+  curl_setopt($ch,CURLOPT_POST, true);
+  curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
+  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+    "Authorization: Bearer SECRET_KEY",
+    "Cache-Control: no-cache",
+  ));
+
+  //So that curl_exec returns the contents of the cURL; rather than echoing it
+  curl_setopt($ch,CURLOPT_RETURNTRANSFER, true); 
+
+  //execute post
+  $result = curl_exec($ch);
+  echo $result;
+?>

src/api/preauthorization/reserve/index.php

@@ -0,0 +1,31 @@
+<?php
+  $url = "https://api.paystack.co/preauthorization/reserve_authorization";
+
+  $fields = [
+    'email' => '[email protected]',
+    'currency' => 'ZAR',
+    'amount' => 1000,
+    'authorization_code' => 'AUTH_dalhwqi5vw',  
+  ];
+
+  $fields_string = http_build_query($fields);
+
+  //open connection
+  $ch = curl_init();
+
+  //set the url, number of POST vars, POST data
+  curl_setopt($ch,CURLOPT_URL, $url);
+  curl_setopt($ch,CURLOPT_POST, true);
+  curl_setopt($ch,CURLOPT_POSTFIELDS, $fields_string);
+  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
+    "Authorization: Bearer SECRET_KEY",
+    "Cache-Control: no-cache",
+  ));
+
+  //So that curl_exec returns the contents of the cURL; rather than echoing it
+  curl_setopt($ch,CURLOPT_RETURNTRANSFER, true); 
+
+  //execute post
+  $result = curl_exec($ch);
+  echo $result;
+?>

src/api/preauthorization/verify/index.php

@@ -0,0 +1,28 @@
+<?php
+  $curl = curl_init();
+
+  curl_setopt_array($curl, array(
+    CURLOPT_URL => "https://api.paystack.co/preauthorization/verify/:reference",
+    CURLOPT_RETURNTRANSFER => true,
+    CURLOPT_ENCODING => "",
+    CURLOPT_MAXREDIRS => 10,
+    CURLOPT_TIMEOUT => 30,
+    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
+    CURLOPT_CUSTOMREQUEST => "GET",
+    CURLOPT_HTTPHEADER => array(
+      "Authorization: Bearer SECRET_KEY",
+      "Cache-Control: no-cache",
+    ),
+  ));
+
+  $response = curl_exec($curl);
+  $err = curl_error($curl);
+
+  curl_close($curl);
+
+  if ($err) {
+    echo "cURL Error #:" . $err;
+  } else {
+    echo $response;
+  }
+?>