How to setup complete onsite payment instead of Wallee website.

Question

I need wallee payment on my website instead of wallee payment site, on wallee website i am done with the payment where i was using FirstData payment method with the Transaction Service.
now i am using Card Processing Service with its 'Process' method and using same FirstData payment method but getting errors every time.
I am getting error like "The payment method configuration provided by the ID either does not exists or you are not allowed to access it" .

Answer 1

I had a look into your space. I see that the transactions are not completed. Now the problem is as visible on the screenshot below that the API credentials (username, password, certificate or certificate password) are not correct. Please verify with FirstData and update the credentials there.