Implement observability interface and refactoring

.editorconfig

@@ -5,4 +5,4 @@ end_of_line = lf
 insert_final_newline = true
 tab_width = 4
 indent_style = space
-charset = utf-8
+charset = utf-8

composer.json

@@ -1,6 +1,6 @@
 {
     "name": "bowphp/payment",
-    "description": "The paymemt gateway for Bow Framwork",
+    "description": "The payment gateway for Bow Framework",
     "type": "library",
     "require": {
         "guzzlehttp/guzzle": "^6.5",

config/payment.php

@@ -19,16 +19,18 @@
     /**
      * List of available gateway
      */
-    'ivoiry_cost' => [
+    'ivory_coast' => [
         'orange' => [
             'client_key' => '',
             'client_secret' => '',
             'webhook_secret' => ''
         ],
 
         'mtn' => [
-            'client_key' => '',
-            'client_secret' => '',
+            'subscription_key' => '',
+            'api_user' => '',
+            'api_key' => '',
+            'environment' => 'sandbox', // or 'production'
             'webhook_secret' => ''
         ],