add bitinflow payments subscriptions

AUTH.md

@@ -0,0 +1,61 @@
+# Implementing Auth
+
+This method should typically be called in the `boot` method of your `AuthServiceProvider` class:
+
+```php
+use GhostZero\BitinflowAccounts\BitinflowAccounts;
+use GhostZero\BitinflowAccounts\Providers\BitinflowAccountsSsoUserProvider;
+use Illuminate\Http\Request;
+
+/**
+ * Register any authentication / authorization services.
+ *
+ * @return void
+ */
+public function boot()
+{
+    Auth::provider('sso-users', function ($app, array $config) {
+        return new BitinflowAccountsSsoUserProvider(
+            $app->make(BitinflowAccounts::class),
+            $app->make(Request::class),
+            $config['model'],
+            $config['fields'] ?? [],
+            $config['assess_token_field'] ?? null
+        );
+    });
+}
+```
+
+reference the guard in the `guards` configuration of your `auth.php` configuration file:
+
+```php
+'guards' => [
+    'web' => [
+        'driver' => 'session',
+        'provider' => 'users',
+    ],
+
+    'api' => [
+        'driver' => 'bitinflow-accounts',
+        'provider' => 'sso-users',
+    ],
+],
+```
+
+reference the provider in the `providers` configuration of your `auth.php` configuration file:
+
+```php
+'providers' => [
+    'users' => [
+        'driver' => 'eloquent',
+        'model' => App\Models\User::class,
+    ],
+    
+    'sso-users' => [
+        'driver' => 'sso-users',
+        'model' => App\Models\User::class,
+        'fields' => ['first_name', 'last_name', 'email'],
+        'assess_token_field' => 'sso_access_token',
+    ],
+],
+```