Good morning again,
I think we have made a misunderstanding from the beginning.
I have to tell you that my site and heberger on a Hidden Service with a .onion address and is accessible only via the browser tor.
When you have done your plugin tests “Coinpayment” with the browser tor, have you heberger your demo site on a Hidden service in .onion?
Because if you host your site on the clear web with a .com domain name (for example) your plugins will work properly via TOR, but I will eventually not have the same result as you if my site is heberger on a Hidden Service in .onion …
Waiting for your answer.
Cordially.