Add unit test and update readme

Author: Camille Islasse

Diff for: README.md

@@ -1,7 +1,7 @@
 PayumPayzen
 ===========
 
-PayZen Payum Gateway (Systempay, Scellius, CLIC&PAY, OSB)
+PayZen Payum Gateway (Systempay, Scellius, CLIC&PAY, OSB, SOGE_COMMERCE)
 
 [![Build](https://github.com/ekyna/PayumPayzen/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/ekyna/PayumPayzen/actions/workflows/build.yml)
 
@@ -24,6 +24,7 @@ $gateway = $factory->create([
     'hash_mode'   => Api::HASH_MODE_SHA256,
     'directory'   => __DIR__ . '/payzen-cache',
     'endpoint'    => Api::ENDPOINT_SYSTEMPAY, // default value, see `Api::ENDPOINT_*` constants for more
+    'endpoint_url'    => // null default value, add custom endpoint not in  `Api::ENDPOINT_*` constants 
 ]);
 
 // Register your convert payment action

Diff for: tests/Api/ApiTest.php

@@ -197,6 +197,19 @@ public function provideCreateRequestUrl(): Generator
             ],
             'https://secure.osb.pf/vads-payment/?vads_action_mode=INTERACTIVE&vads_page_action=PAYMENT&vads_payment_config=SINGLE&vads_return_mode=POST&vads_version=V2&vads_amount=1234&vads_currency=978&vads_trans_date=20200101120000&vads_trans_id=000001&vads_site_id=123456789&vads_ctx_mode=PRODUCTION&signature=p9TbeohlOZVPAmhEwfAlGxRJxFAKpNg5wYBSN9emuqs%3D',
         ];
+
+        yield [
+            [
+                'endpoint' => Api::ENDPOINT_SOGECOMMERCE,
+            ],
+            [
+                'vads_amount'     => '1234',
+                'vads_currency'   => '978',
+                'vads_trans_date' => '20200101120000',
+                'vads_trans_id'   => '000001',
+            ],
+            'https://sogecommerce.societegenerale.eu/vads-payment/?vads_action_mode=INTERACTIVE&vads_page_action=PAYMENT&vads_payment_config=SINGLE&vads_return_mode=POST&vads_version=V2&vads_amount=1234&vads_currency=978&vads_trans_date=20200101120000&vads_trans_id=000001&vads_site_id=123456789&vads_ctx_mode=PRODUCTION&signature=p9TbeohlOZVPAmhEwfAlGxRJxFAKpNg5wYBSN9emuqs%3D',
+        ];
     }
 
     /**