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My client does not want to allow "American Express" transactions. How do I manage which card types are permitted?

I understand there are two types, and I know that one was chosen when the account was created; but how can I tell which is it after it has been made?

I have created TWO sandbox accounts. One is CP and the other CNP.I am attempting to run the sample PHP code to process a single CC transaction. Using both accounts I am given the same error. I can't for the life of me figure out why. ERROR 87: (TESTM...