For me, Paypal did not work, but I was able to change payment to credit card as follows:
On this page press “click here to complete payment”:
On this page press “Attention!”:
On this page press “Change Method”:
Then you can enter credit card data:
This worked for me when changing from Paypal to Credit Card, don’t know if it works the other way too.
Payments with Paypal seem to be very complicated. You need “preapproval” plus a “secondary funding source”, as it is explained in this post:
