Help for Aimeos

Hi i am trying to implement MangoPay as a payment provider, i created the provider and it is recognized in the admin panel. So far everything is good, but i would like to generate a form in the checkout process as described here: https://aimeos.org/docs/Developers/Libr ... he_payment
The only problem is that the MangoPay APIs need Basic Access Authentication, is there any way to pass a Basic access key?

HTTP basic auth is a HTTP header that is sent to the server and you can't add that to a form:
https://stackoverflow.com/questions/951 ... ost-a-form

I guess there must be another way to authenticate with MangoPay because supporting only HTTP basic auth would limit the usage of MangoPay as payment provider very much.