Some payment methods are not compatible with integration by iframe. Here is a non-exhaustive list:
  • 3x 4x Oney
  • Giropay
  • iDeal
  • PayPal
  • Sofort Banking

Iframe mode is not recommended if you propose payment methods using redirection to a third party website.

In order to ensure full compatibility with all the authentication servers, we do not recommend using the SANDBOX attribute (