I am in the sand box environment. I have created two merchants for the environment. I make an authentication call using the same login for both merchants. Both authentications appear successful (I get an OAuth Token), however, on the second merchant I am getting unauthorized in the response for subsequent API calls.
Can I use the same login with more than one merchant in the test environment? Do I need to create a second login for the sand box? I assume one merchant could have more than one store, so this would be a real world scenario.