public function delete($id)
 {
     // DELETE direct_debit_authorities doesn't
     // return JSON on success, but NULL
     PromisePay::RestClient('delete', 'direct_debit_authorities/' . $id);
     $result = PromisePay::getDebugData();
     if ($result->code == 200) {
         return true;
     } else {
         return false;
     }
 }