Hello GaryC9,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
I’m sorry to hear that you’ve encountered issues while attempting to add contacts to your lists via our V2 API. Could you confirm which endpoint you’re using for this request? Based on your code It looks like it’s either the Contacts Collections endpoint or the Bulk Activities Import Contacts endpoint.
Contacts Collections Endpoint:
https://v2.developer.constantcontact.com/docs/contacts-api/contacts-collection.html?method=POST
Bulk Activities Import Contacts Endpoint:
https://v2.developer.constantcontact.com/docs/bulk_activities_api/bulk-activities-import-contacts.html
I would also note that while our V2 API endpoints are currently functional, we do plan to deprecate them and I would highly recommend moving your application to our V3 API. For more information on this version, I am including some documentation below.
Getting Started Guide for V3:
https://developer.constantcontact.com/api_guide/index.html
Create or Update a Contact using a SIngle Method:
https://developer.constantcontact.com/api_guide/contacts_create_or_update.html
Please have a look and let us know if you have any other questions!
Regards,
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