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This is probably a dumb question but do I have to use a Customer Profile ID? I have my server set up so that the user enters their account number and amount they want to pay... everything works in sandbox.. when testing on live.. it's saying I need a...

Where would I find a demo cliet ID to test in this app? it's hosted on my SSL encrypted server and I can't get it to go from login.php to index.php. Please forgive my lack of knowlege, I'm new to working with these kinds of API's. Thank you ahead of ...