Hello,
Thank you for reaching out to Constant Contact API Developer Support.
The issue is that you are including an "address_type" field in your "addresses" object which is not expected. This is not able to be used because there is no column header available for it. If you remove the address_type from your JSON, the call will complete successfully.
Please let us know if you have any other questions!
Regards,
David B. Tier II API Support Engineer
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