I can’t really find an answer on this one, please help. 
after several days of trying, I surrender. can’t really find a way to make a checkout. payment always failed. I try all my cards. even in the US but it’s not really accepting. if it’s not (process_error) then it’s (don_not_honor).
Here is my site Read-Only: LINK
(how to share your site Read-Only link)