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Posting the message below to 'https://test.authorize.net/gateway/transact.dll' using the 'POST' method, receiving the reply:

The following errors have occurred.

(13) The merchant login ID or password is invalid or the account is inactive.
So I tried th...

Where can I find max size for all message fields? Thanks,Juan SilvaMy Small Bizz, LLC

Hi all, I am an Alpha developer, I know non of you probable have ever heard of then, that is a big part of my problem. I can not use any of the code samples out there, but I can do XML. So here is my question, which of the Authorize.net interfaces is...