How to grant access to payment information to the Tester sandbox

Hi, I created a tester account to test some integration of my apple pay, and I need to understand how to have access to the merchant id used on my Developer account? Because When I am on my test sandbox and I access the certificate, it gives me a msg that Certificate, Ids.." : Unable to find a team with the given Team ID ''XXXX' to which you belong. So I believe someone need to provide me access from the Developer account.

Could someone please instruct me on how to do this? I cannot find any documentation explaining it, and I have contacted Apple support and no one has given me an answer, which is super weird, since this appear to be such a normal procedure during testing.

Thanks

How to grant access to payment information to the Tester sandbox
 
 
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