Hi,
I would be glad to pay 20$ with my mastercard, but the only option is paypal and paypal force me to create an account. The problem is that paypal UI forces me to create a paypal account, wich seem to be impossible : I deleted a few month ago my paypal account, but it seems still linked with my card number and paypal refuses to let me create a new one ...

Also, I really don't want to make business with Paypal, since this company has a really bad customer relationship history.

My advice : you really should investigate to allow an alternate way of payment not using such company (paypal) or for example allow bitcoin payment.

In between, I won't be able to use your product, wich is really counter-productive for me.