From 34b41090f0d0e9a47e181fc56d030ab3afa52941 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Armando=20Rodr=C3=ADguez?=
 <127134616+armando-rodriguez-cko@users.noreply.github.com>
Date: Tue, 27 Feb 2024 13:43:40 +0100
Subject: [PATCH 1/4] Add documents to OnboardEntityRequest

---
 accounts/entities.go | 42 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/accounts/entities.go b/accounts/entities.go
index 31da7b2..e6e1bcb 100644
--- a/accounts/entities.go
+++ b/accounts/entities.go
@@ -2,21 +2,51 @@ package accounts
 
 import "github.com/checkout/checkout-sdk-go/common"
 
+type CompanyVerificationType string
+
+const (
+	IncorporationDocument CompanyVerificationType = "incorporation_document"
+	ArticlesOfAssociation CompanyVerificationType = "articles_of_association"
+)
+
+type TaxVerificationType string
+
+const (
+	EinLetter TaxVerificationType = "ein_letter"
+)
+
 type (
+	CompanyVerification struct {
+		Type  CompanyVerificationType `json:"type,omitempty"`
+		Front string                  `json:"front,omitempty"`
+	}
+
+	TaxVerification struct {
+		Type  TaxVerificationType `json:"type,omitempty"`
+		Front string              `json:"front,omitempty"`
+	}
+
+	OnboardSubEntityDocuments struct {
+		IdentityVerification *Document            `json:"identity_verification,omitempty"`
+		CompanyVerification  *CompanyVerification `json:"company_verification,omitempty"`
+		TaxVerification      *TaxVerification     `json:"tax_verification,omitempty"`
+	}
+
 	OnboardEntityRequest struct {
-		Reference      string          `json:"reference,omitempty"`
-		ContactDetails *ContactDetails `json:"contact_details,omitempty"`
-		Profile        *Profile        `json:"profile,omitempty"`
-		Company        *Company        `json:"company,omitempty"`
-		Individual     *Individual     `json:"individual,omitempty"`
+		Reference      string                     `json:"reference,omitempty"`
+		ContactDetails *ContactDetails            `json:"contact_details,omitempty"`
+		Profile        *Profile                   `json:"profile,omitempty"`
+		Company        *Company                   `json:"company,omitempty"`
+		Individual     *Individual                `json:"individual,omitempty"`
+		Documents      *OnboardSubEntityDocuments `json:",omitempty"`
 	}
 
 	OnboardEntityResponse struct {
 		HttpMetadata    common.HttpMetadata `json:"http_metadata,omitempty"`
 		Id              string              `json:"id,omitempty"`
 		Reference       string              `json:"reference,omitempty"`
-		Capabilities    *Capabilities       `json:"capabilities,omitempty"`
 		Status          OnboardingStatus    `json:"status,omitempty"`
+		Capabilities    *Capabilities       `json:"capabilities,omitempty"`
 		RequirementsDue []RequirementsDue   `json:"requirements_due,omitempty"`
 	}
 

From a411abe065e818fa7bcbf48c4465397508b2a16c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Armando=20Rodr=C3=ADguez?=
 <127134616+armando-rodriguez-cko@users.noreply.github.com>
Date: Tue, 27 Feb 2024 13:44:20 +0100
Subject: [PATCH 2/4] Add ChallengeNotificationUrl to nonHostedCompletion

---
 sessions/completion/completion.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sessions/completion/completion.go b/sessions/completion/completion.go
index 4460555..9dd034a 100644
--- a/sessions/completion/completion.go
+++ b/sessions/completion/completion.go
@@ -25,7 +25,8 @@ type (
 
 	nonHostedCompletion struct {
 		CompletionInfo
-		CallbackUrl string `json:"callback_url,omitempty"`
+		CallbackUrl              string `json:"callback_url,omitempty"`
+		ChallengeNotificationUrl string `json:"challenge_notification_url,omitempty"`
 	}
 )
 

From 293ebd4289c27ff588c3888adc5027dec7e11e9b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Armando=20Rodr=C3=ADguez?=
 <127134616+armando-rodriguez-cko@users.noreply.github.com>
Date: Tue, 27 Feb 2024 13:44:43 +0100
Subject: [PATCH 3/4] Update PaymentContextDetailsResponse

---
 payments/contexts/contexts.go | 1 -
 1 file changed, 1 deletion(-)

diff --git a/payments/contexts/contexts.go b/payments/contexts/contexts.go
index 787455b..9d3c34f 100644
--- a/payments/contexts/contexts.go
+++ b/payments/contexts/contexts.go
@@ -126,6 +126,5 @@ type (
 		HttpMetadata    common.HttpMetadata
 		PaymentRequest  *PaymentContextsResponse        `json:"payment_request,omitempty"`
 		PartnerMetadata *PaymentContextsPartnerMetadata `json:"partner_metadata,omitempty"`
-		Customer        map[string]interface{}          `json:"customer,omitempty"`
 	}
 )

From a60c0bcbbd35314d6469de8ceb64907a666a007b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Armando=20Rodr=C3=ADguez?=
 <127134616+armando-rodriguez-cko@users.noreply.github.com>
Date: Tue, 27 Feb 2024 13:46:40 +0100
Subject: [PATCH 4/4] Add subdomain for merchants

---
 .github/workflows/build-master.yml       |  1 +
 .github/workflows/build-pull-request.yml |  1 +
 .github/workflows/build-release.yml      |  1 +
 abc/checkout_previous_sdk_builder.go     | 10 ++++
 configuration/configuration.go           | 37 ++++++++++--
 configuration/environment.go             | 31 ++++++++++
 configuration/sdk_builder.go             |  7 ++-
 nas/checkout_api.go                      |  3 +
 nas/checkout_default_sdk_builder.go      | 10 ++++
 nas/checkout_oauth_sdk_builder.go        |  9 +++
 test/configuration_api_test.go           | 54 +++++++++++++++++
 test/default_sdk_api_test.go             | 71 +++++++++++++++++++++++
 test/oauth_sdk_api_test.go               | 74 ++++++++++++++++++++++++
 test/previous_sdk_api_test.go            | 71 +++++++++++++++++++++++
 14 files changed, 373 insertions(+), 7 deletions(-)
 create mode 100644 test/configuration_api_test.go
 create mode 100644 test/default_sdk_api_test.go
 create mode 100644 test/oauth_sdk_api_test.go
 create mode 100644 test/previous_sdk_api_test.go

diff --git a/.github/workflows/build-master.yml b/.github/workflows/build-master.yml
index 6ac37f9..6d250bf 100644
--- a/.github/workflows/build-master.yml
+++ b/.github/workflows/build-master.yml
@@ -35,6 +35,7 @@ jobs:
           CHECKOUT_DEFAULT_OAUTH_ACCOUNTS_CLIENT_SECRET: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ACCOUNTS_CLIENT_SECRET }}
           CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_ID: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_ID }}
           CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_SECRET: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_SECRET }}
+          CHECKOUT_MERCHANT_SUBDOMAIN: ${{ secrets.IT_CHECKOUT_MERCHANT_SUBDOMAIN }}
         run:
           go build && go test -v -timeout 5m ./...
 
diff --git a/.github/workflows/build-pull-request.yml b/.github/workflows/build-pull-request.yml
index 29f72f1..7429916 100644
--- a/.github/workflows/build-pull-request.yml
+++ b/.github/workflows/build-pull-request.yml
@@ -35,5 +35,6 @@ jobs:
           CHECKOUT_DEFAULT_OAUTH_ACCOUNTS_CLIENT_SECRET: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ACCOUNTS_CLIENT_SECRET }}
           CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_ID: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_ID }}
           CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_SECRET: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_SECRET }}
+          CHECKOUT_MERCHANT_SUBDOMAIN: ${{ secrets.IT_CHECKOUT_MERCHANT_SUBDOMAIN }}
         run:
           go build && go test -v -timeout 5m ./...
diff --git a/.github/workflows/build-release.yml b/.github/workflows/build-release.yml
index 0b75ac2..a63866c 100644
--- a/.github/workflows/build-release.yml
+++ b/.github/workflows/build-release.yml
@@ -34,6 +34,7 @@ jobs:
           CHECKOUT_DEFAULT_OAUTH_ACCOUNTS_CLIENT_SECRET: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ACCOUNTS_CLIENT_SECRET }}
           CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_ID: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_ID }}
           CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_SECRET: ${{ secrets.IT_CHECKOUT_DEFAULT_OAUTH_ISSUING_CLIENT_SECRET }}
+          CHECKOUT_MERCHANT_SUBDOMAIN: ${{ secrets.IT_CHECKOUT_MERCHANT_SUBDOMAIN }}
         run:
           go build && go test -v -timeout 5m ./...
       - id: read-version
diff --git a/abc/checkout_previous_sdk_builder.go b/abc/checkout_previous_sdk_builder.go
index c54bb2c..ea54e0f 100644
--- a/abc/checkout_previous_sdk_builder.go
+++ b/abc/checkout_previous_sdk_builder.go
@@ -15,6 +15,11 @@ func (b *CheckoutPreviousSdkBuilder) WithEnvironment(environment configuration.E
 	return b
 }
 
+func (b *CheckoutPreviousSdkBuilder) WithEnvironmentSubdomain(subdomain string) *CheckoutPreviousSdkBuilder {
+	b.EnvironmentSubdomain = configuration.NewEnvironmentSubdomain(b.Environment, subdomain)
+	return b
+}
+
 func (b *CheckoutPreviousSdkBuilder) WithHttpClient(client *http.Client) *CheckoutPreviousSdkBuilder {
 	b.HttpClient = client
 	return b
@@ -47,7 +52,12 @@ func (b *CheckoutPreviousSdkBuilder) Build() (*Api, error) {
 	}
 
 	sdkCredentials := configuration.NewPreviousKeysSdkCredentials(b.SecretKey, b.PublicKey)
+
 	newConfiguration := configuration.NewConfiguration(sdkCredentials, b.Environment, b.HttpClient, b.Logger)
 
+	if b.EnvironmentSubdomain != nil {
+		newConfiguration = configuration.NewConfigurationWithSubdomain(sdkCredentials, b.Environment, b.EnvironmentSubdomain, b.HttpClient, b.Logger)
+	}
+
 	return CheckoutApi(newConfiguration), nil
 }
diff --git a/configuration/configuration.go b/configuration/configuration.go
index 241d362..ee4aa78 100644
--- a/configuration/configuration.go
+++ b/configuration/configuration.go
@@ -7,10 +7,11 @@ import (
 )
 
 type Configuration struct {
-	Credentials SdkCredentials
-	Environment Environment
-	HttpClient  http.Client
-	Logger      StdLogger
+	Credentials          SdkCredentials
+	Environment          Environment
+	EnvironmentSubdomain *EnvironmentSubdomain
+	HttpClient           http.Client
+	Logger               StdLogger
 }
 
 func NewConfiguration(
@@ -38,3 +39,31 @@ func NewConfiguration(
 		Logger:      logger,
 	}
 }
+
+func NewConfigurationWithSubdomain(
+	credentials SdkCredentials,
+	environment Environment,
+	environmentSubdomain *EnvironmentSubdomain,
+	client *http.Client,
+	logger StdLogger,
+) *Configuration {
+	if environment == nil {
+		environment = Sandbox()
+	}
+
+	if client == nil {
+		client = common.BuildDefaultClient()
+	}
+
+	if logger == nil {
+		logger = DefaultLogger()
+	}
+
+	return &Configuration{
+		Credentials:          credentials,
+		Environment:          environment,
+		EnvironmentSubdomain: environmentSubdomain,
+		HttpClient:           *client,
+		Logger:               logger,
+	}
+}
diff --git a/configuration/environment.go b/configuration/environment.go
index 723652d..49fa9ed 100644
--- a/configuration/environment.go
+++ b/configuration/environment.go
@@ -1,5 +1,10 @@
 package configuration
 
+import (
+	"net/url"
+	"regexp"
+)
+
 type Environment interface {
 	BaseUri() string
 	AuthorizationUri() string
@@ -9,6 +14,32 @@ type Environment interface {
 	IsSandbox() bool
 }
 
+type EnvironmentSubdomain struct {
+	ApiUrl string
+}
+
+func NewEnvironmentSubdomain(environment Environment, subdomain string) *EnvironmentSubdomain {
+	apiUrl := addSubdomainToApiUrlEnvironment(environment, subdomain)
+	return &EnvironmentSubdomain{ApiUrl: apiUrl}
+}
+
+func addSubdomainToApiUrlEnvironment(environment Environment, subdomain string) string {
+	apiUrl := environment.BaseUri()
+
+	newEnvironment := apiUrl
+
+	regex := regexp.MustCompile("^[0-9a-z]{8}$")
+
+	if regex.MatchString(subdomain) {
+		merchantApiUrl, _ := url.Parse(apiUrl)
+		merchantApiUrl.Host = subdomain + "." + merchantApiUrl.Host
+
+		newEnvironment = merchantApiUrl.String()
+	}
+
+	return newEnvironment
+}
+
 type CheckoutEnv struct {
 	baseUri          string
 	authorizationUri string
diff --git a/configuration/sdk_builder.go b/configuration/sdk_builder.go
index e7fc63d..d29fdfc 100644
--- a/configuration/sdk_builder.go
+++ b/configuration/sdk_builder.go
@@ -3,9 +3,10 @@ package configuration
 import "net/http"
 
 type SdkBuilder struct {
-	Environment Environment
-	HttpClient  *http.Client
-	Logger      StdLogger
+	Environment          Environment
+	EnvironmentSubdomain *EnvironmentSubdomain
+	HttpClient           *http.Client
+	Logger               StdLogger
 }
 
 func (s *SdkBuilder) GetConfiguration(string, string) *Configuration {
diff --git a/nas/checkout_api.go b/nas/checkout_api.go
index 27afd43..6e9bbdb 100644
--- a/nas/checkout_api.go
+++ b/nas/checkout_api.go
@@ -84,6 +84,9 @@ func CheckoutApi(configuration *configuration.Configuration) *Api {
 }
 
 func buildBaseClient(configuration *configuration.Configuration) client.HttpClient {
+	if configuration.EnvironmentSubdomain != nil {
+		return client.NewApiClient(configuration, configuration.EnvironmentSubdomain.ApiUrl)
+	}
 	return client.NewApiClient(configuration, configuration.Environment.BaseUri())
 }
 
diff --git a/nas/checkout_default_sdk_builder.go b/nas/checkout_default_sdk_builder.go
index 44778c5..1075424 100644
--- a/nas/checkout_default_sdk_builder.go
+++ b/nas/checkout_default_sdk_builder.go
@@ -15,6 +15,11 @@ func (b *CheckoutDefaultSdkBuilder) WithEnvironment(environment configuration.En
 	return b
 }
 
+func (b *CheckoutDefaultSdkBuilder) WithEnvironmentSubdomain(subdomain string) *CheckoutDefaultSdkBuilder {
+	b.EnvironmentSubdomain = configuration.NewEnvironmentSubdomain(b.Environment, subdomain)
+	return b
+}
+
 func (b *CheckoutDefaultSdkBuilder) WithHttpClient(client *http.Client) *CheckoutDefaultSdkBuilder {
 	b.HttpClient = client
 	return b
@@ -47,7 +52,12 @@ func (b *CheckoutDefaultSdkBuilder) Build() (*Api, error) {
 	}
 
 	sdkCredentials := configuration.NewDefaultKeysSdkCredentials(b.SecretKey, b.PublicKey)
+
 	newConfiguration := configuration.NewConfiguration(sdkCredentials, b.Environment, b.HttpClient, b.Logger)
 
+	if b.EnvironmentSubdomain != nil {
+		newConfiguration = configuration.NewConfigurationWithSubdomain(sdkCredentials, b.Environment, b.EnvironmentSubdomain, b.HttpClient, b.Logger)
+	}
+
 	return CheckoutApi(newConfiguration), nil
 }
diff --git a/nas/checkout_oauth_sdk_builder.go b/nas/checkout_oauth_sdk_builder.go
index 45c9716..c427ccc 100644
--- a/nas/checkout_oauth_sdk_builder.go
+++ b/nas/checkout_oauth_sdk_builder.go
@@ -36,6 +36,11 @@ func (b *CheckoutOAuthSdkBuilder) WithEnvironment(environment configuration.Envi
 	return b
 }
 
+func (b *CheckoutOAuthSdkBuilder) WithEnvironmentSubdomain(subdomain string) *CheckoutOAuthSdkBuilder {
+	b.EnvironmentSubdomain = configuration.NewEnvironmentSubdomain(b.Environment, subdomain)
+	return b
+}
+
 func (b *CheckoutOAuthSdkBuilder) WithHttpClient(client *http.Client) *CheckoutOAuthSdkBuilder {
 	b.HttpClient = client
 	return b
@@ -67,5 +72,9 @@ func (b *CheckoutOAuthSdkBuilder) Build() (*Api, error) {
 
 	newConfiguration := configuration.NewConfiguration(sdkCredentials, b.Environment, b.HttpClient, b.Logger)
 
+	if b.EnvironmentSubdomain != nil {
+		newConfiguration = configuration.NewConfigurationWithSubdomain(sdkCredentials, b.Environment, b.EnvironmentSubdomain, b.HttpClient, b.Logger)
+	}
+
 	return CheckoutApi(newConfiguration), nil
 }
diff --git a/test/configuration_api_test.go b/test/configuration_api_test.go
new file mode 100644
index 0000000..061731a
--- /dev/null
+++ b/test/configuration_api_test.go
@@ -0,0 +1,54 @@
+package test
+
+import (
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/checkout/checkout-sdk-go/configuration"
+	"github.com/checkout/checkout-sdk-go/mocks"
+)
+
+func TestShouldCreateConfiguration(t *testing.T) {
+	credentials := new(mocks.CredentialsMock)
+	environment := configuration.Production()
+	subdomain := configuration.NewEnvironmentSubdomain(environment, "123dmain")
+	subdomainBad := configuration.NewEnvironmentSubdomain(environment, "baddomain")
+
+	cases := []struct {
+		name          string
+		configuration *configuration.Configuration
+		checker       func(*configuration.Configuration, error)
+	}{
+		{
+			name:          "should create a configuration object",
+			configuration: configuration.NewConfiguration(credentials, environment, &http.Client{}, nil),
+			checker: func(configuration *configuration.Configuration, err error) {
+				assert.NotNil(t, configuration)
+			},
+		},
+		{
+			name:          "should create a configuration object with a valid subdomain",
+			configuration: configuration.NewConfigurationWithSubdomain(credentials, environment, subdomain, &http.Client{}, nil),
+			checker: func(configuration *configuration.Configuration, err error) {
+				assert.NotNil(t, configuration)
+				assert.Equal(t, "https://123dmain.api.checkout.com", configuration.EnvironmentSubdomain.ApiUrl)
+			},
+		},
+		{
+			name:          "should create a configuration object with a invalid subdomain",
+			configuration: configuration.NewConfigurationWithSubdomain(credentials, environment, subdomainBad, &http.Client{}, nil),
+			checker: func(configuration *configuration.Configuration, err error) {
+				assert.NotNil(t, configuration)
+				assert.Equal(t, "https://api.checkout.com", configuration.EnvironmentSubdomain.ApiUrl)
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			tc.checker(tc.configuration, nil)
+		})
+	}
+}
diff --git a/test/default_sdk_api_test.go b/test/default_sdk_api_test.go
new file mode 100644
index 0000000..717d7ec
--- /dev/null
+++ b/test/default_sdk_api_test.go
@@ -0,0 +1,71 @@
+package test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/checkout/checkout-sdk-go"
+	"github.com/checkout/checkout-sdk-go/configuration"
+	"github.com/checkout/checkout-sdk-go/nas"
+)
+
+func TestDefaultCheckoutSdks(t *testing.T) {
+	var defaultApi, _ = checkout.Builder().
+		StaticKeys().
+		WithSecretKey(os.Getenv("CHECKOUT_DEFAULT_SECRET_KEY")).
+		WithPublicKey(os.Getenv("CHECKOUT_DEFAULT_PUBLIC_KEY")).
+		WithEnvironment(configuration.Sandbox()).
+		Build()
+
+	var defaultApiSubdomain, _ = checkout.Builder().
+		StaticKeys().
+		WithSecretKey(os.Getenv("CHECKOUT_DEFAULT_SECRET_KEY")).
+		WithPublicKey(os.Getenv("CHECKOUT_DEFAULT_PUBLIC_KEY")).
+		WithEnvironment(configuration.Sandbox()).
+		WithEnvironmentSubdomain("123dmain").
+		Build()
+
+	var defaultApiBad, _ = checkout.Builder().
+		StaticKeys().
+		WithSecretKey("error").
+		WithPublicKey("error").
+		WithEnvironment(configuration.Sandbox()).
+		Build()
+
+	cases := []struct {
+		name       string
+		defaultApi *nas.Api
+		checker    func(*nas.Api, error)
+	}{
+		{
+			name:       "should create a default checkout sdk api object",
+			defaultApi: defaultApi,
+			checker: func(token *nas.Api, err error) {
+				assert.NotNil(t, defaultApi)
+			},
+		},
+		{
+			name:       "should create a default checkout sdk api object with valid subdomain",
+			defaultApi: defaultApiSubdomain,
+			checker: func(token *nas.Api, err error) {
+				assert.NotNil(t, defaultApiSubdomain)
+			},
+		},
+		{
+			name:       "should fail a default checkout sdk api object",
+			defaultApi: defaultApiBad,
+			checker: func(token *nas.Api, err error) {
+				assert.Nil(t, defaultApiBad)
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			tc.checker(tc.defaultApi, nil)
+		})
+	}
+
+}
diff --git a/test/oauth_sdk_api_test.go b/test/oauth_sdk_api_test.go
new file mode 100644
index 0000000..1e1e74a
--- /dev/null
+++ b/test/oauth_sdk_api_test.go
@@ -0,0 +1,74 @@
+package test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/checkout/checkout-sdk-go"
+	"github.com/checkout/checkout-sdk-go/configuration"
+	"github.com/checkout/checkout-sdk-go/nas"
+)
+
+func TestOauthCheckoutSdks(t *testing.T) {
+	var oauthApi, _ = checkout.Builder().
+		OAuth().
+		WithClientCredentials(
+			os.Getenv("CHECKOUT_DEFAULT_OAUTH_CLIENT_ID"),
+			os.Getenv("CHECKOUT_DEFAULT_OAUTH_CLIENT_SECRET")).
+		WithEnvironment(configuration.Sandbox()).
+		Build()
+
+	var oauthApiSubdomain, _ = checkout.Builder().
+		OAuth().
+		WithClientCredentials(
+			os.Getenv("CHECKOUT_DEFAULT_OAUTH_CLIENT_ID"),
+			os.Getenv("CHECKOUT_DEFAULT_OAUTH_CLIENT_SECRET")).
+		WithEnvironment(configuration.Sandbox()).
+		WithEnvironmentSubdomain("123dmain").
+		Build()
+
+	var oauthApiBad, _ = checkout.Builder().
+		OAuth().
+		WithClientCredentials(
+			"error",
+			"error").
+		WithEnvironment(configuration.Sandbox()).
+		Build()
+
+	cases := []struct {
+		name     string
+		oauthApi *nas.Api
+		checker  func(*nas.Api, error)
+	}{
+		{
+			name:     "should create a oauth checkout sdk api object",
+			oauthApi: oauthApi,
+			checker: func(token *nas.Api, err error) {
+				assert.NotNil(t, oauthApi)
+			},
+		},
+		{
+			name:     "should create a oauth checkout sdk api object with valid subdomain",
+			oauthApi: oauthApiSubdomain,
+			checker: func(token *nas.Api, err error) {
+				assert.NotNil(t, oauthApiSubdomain)
+			},
+		},
+		{
+			name:     "should fail a oauth checkout sdk api object",
+			oauthApi: oauthApiBad,
+			checker: func(token *nas.Api, err error) {
+				assert.Nil(t, oauthApiBad)
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			tc.checker(tc.oauthApi, nil)
+		})
+	}
+
+}
diff --git a/test/previous_sdk_api_test.go b/test/previous_sdk_api_test.go
new file mode 100644
index 0000000..3cd6fde
--- /dev/null
+++ b/test/previous_sdk_api_test.go
@@ -0,0 +1,71 @@
+package test
+
+import (
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/checkout/checkout-sdk-go"
+	"github.com/checkout/checkout-sdk-go/abc"
+	"github.com/checkout/checkout-sdk-go/configuration"
+)
+
+func TestPreviousCheckoutSdks(t *testing.T) {
+	var previousApi, _ = checkout.Builder().
+		Previous().
+		WithSecretKey(os.Getenv("CHECKOUT_PREVIOUS_SECRET_KEY")).
+		WithPublicKey(os.Getenv("CHECKOUT_PREVIOUS_PUBLIC_KEY")).
+		WithEnvironment(configuration.Sandbox()).
+		Build()
+
+	var previousApiSubdomain, _ = checkout.Builder().
+		Previous().
+		WithSecretKey(os.Getenv("CHECKOUT_PREVIOUS_SECRET_KEY")).
+		WithPublicKey(os.Getenv("CHECKOUT_PREVIOUS_PUBLIC_KEY")).
+		WithEnvironment(configuration.Sandbox()).
+		WithEnvironmentSubdomain("123dmain").
+		Build()
+
+	var previousApiBad, _ = checkout.Builder().
+		Previous().
+		WithSecretKey("error").
+		WithPublicKey("error").
+		WithEnvironment(configuration.Sandbox()).
+		Build()
+
+	cases := []struct {
+		name        string
+		previousApi *abc.Api
+		checker     func(*abc.Api, error)
+	}{
+		{
+			name:        "should create a previous checkout sdk api object",
+			previousApi: previousApi,
+			checker: func(token *abc.Api, err error) {
+				assert.NotNil(t, previousApi)
+			},
+		},
+		{
+			name:        "should create a previous checkout sdk api object with valid subdomain",
+			previousApi: previousApiSubdomain,
+			checker: func(token *abc.Api, err error) {
+				assert.NotNil(t, previousApiSubdomain)
+			},
+		},
+		{
+			name:        "should fail a previous checkout sdk api object",
+			previousApi: previousApiBad,
+			checker: func(token *abc.Api, err error) {
+				assert.Nil(t, previousApiBad)
+			},
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			tc.checker(tc.previousApi, nil)
+		})
+	}
+
+}