https://api.girocheckout.de/ 2026-04-14T07:09:51+00:00 https://api.girocheckout.de/ https://api.girocheckout.de/lib/tpl/s-public/images/favicon.ico text/html 2021-04-12T14:33:31+00:00 Anonymous (anonymous@undisclosed.example.com) https://api.girocheckout.de/en:girocheckout:faq:start?rev=1618230811&do=diff FAQ: Frequently asked questions and problems regarding the API 1) I'm getting the error 5003 (mandatory field not specified), but I have specified all parameters. This error may also mean that you have specified the wrong project ID and password. If this data belongs to a different payment method as intended by you, it is possible that the parameters for that other method are not the same as the ones you are sending. So please make sure that the project data you specify really match your payme…