Thank you for reaching out to the API Support team here at Constant Contact.
The Zapier integration is a 3rd party plugin built by Zapier directly and not built or supported by Constant Contact, so I'm limited in the scope in which I can help with any problems with it.
Have you reached out to Zapier for assistance with your issue? If so, what was their response?
Please let me know if you have any other questions!
Sincerely, David B. API Support Specialist
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