added new middleware called Callback

added role in the user database
added new function hasRole in user model
added new function getUserType in user model
modified registration to handle new column in user model

app/User.php

@@ -27,6 +27,7 @@ class User extends Authenticatable
         'refresh_token', 
         'user_type',
         'scopes',
+        'role',
     ];
 
     protected $table = 'users';
@@ -41,4 +42,13 @@ class User extends Authenticatable
     ];
 
     protected $guarded = [];
+
+    public function hasRole($role)
+    {
+        return User::where('role', $role)->get();
+    }
+
+    public function getUserType() {
+        return User::where('user_type')->get();
+    }
 }