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Is it just a 400 error or a 401 error. The 401 error would represent a problem with credentials. The 400 just means the data is just being built wrong. Are you just submitting a contact using those forms?
thanks for your time and reply. I've actually just submitted the code to one of your support staff.
Yes, it's just 400.
I am submitting the contact from those forms, I placed the PHPSampleForms folder in the root of my domain name.
I first took the two files cc_class and cc_simple_form (after stripping out everything but the email) and tested with those with the same response: 400 for the client and success for my account.
Then I just uploaded the forms, straight from downloading them, onto my server. Changed the credentials, and tested there.
I did not look at the XML that was being created, though.
The only other thing that I could think of is that the List name does not exist in one account but the other. That would cause a 400 error.
Please let me know if that is the cause.