Hello L29126,
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.
Constant Contact provides developers with free access to our V3 API endpoints for developers building their own application for integration. The way contacts are added by 3rd party built integrations to your account will depend on how they were built by the 3rd party developers.
The article below goes into it a little more in-depth:
Welcome Email and COI behaviors when using an API or a 3rd Party Integration/Plugin/Sign-Up form
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/5903-how-apis-affect-autoresponders-and-the-welcome-email
As far as resolving the issue, you could try one of the following:
-Use a list-join automation series instead of a Welcome Email, as they are triggered when a contact is added to a list, rather than by how the contact is added to the account.
-Otherwise, you could look into using a different integration/form that adds contacts in a way that is compatible with the Welcome Email.
For help with creating a list-join automated email series within the Constant Contact Website UI, please reach out to our Support Team at 866-289-2101.
Please have a look and let us know if you have any other questions!
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