Thanks Kel for your great idea!

I would recommend for you to use Paypal’s payment buttons for that.

You should visit the links I will post here, and copy the code for the button.

Then you should head back to Webydo, choose the HTML widget and paste the code inside it.

Buttons for donations:
https://www.paypal.com/us/cgi-bin/?cmd=_donate-intro-outside

Paypal buttons for single purchases:
https://www.paypal.com/cgi-bin/webscr?cmd=_singleitem-intro-outside