Hey,
i have new account and i don;t know why when i integrate my website with amazon payments i cant get test user payment methods (addres works fine). Can you help me?
The system is working as designed. It is not possible for you to change the payment methods.
There is some more information on the following help page:
[Testing your integration with the Sandbox environment|Amazon Pay Documentation].
I hope that this is of help but please do let me know if you have more questions.