/**
  * Store an item.
  *
  * @param  array  $inputs
  * @param  integer $user_id
  * @return boolean
  */
 public function store($inputs)
 {
     $item = new Payment_method();
     foreach ($this->keys as $key) {
         if (array_key_exists($key, $inputs)) {
             $item->{$key} = $inputs[$key];
         }
     }
     $item->save();
     return $item;
 }