Hello MichelleG3808,
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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.
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Contacts added by 3rd party forms/integrations/plugins, are able to receive automated emails based on two factors: Whether the email is added to the account with a source of "contact" or "account (which is specified in the code by whichever 3rd party built the integration), as well as whether the automation is a Welcome Email or a List Join series.
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If using a List Join series, and a contact added to the specified list, regardless of source, will be put into queue to receive the emails for that series.
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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
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For direct assistance with setting up an Automated Series in your account, you can reach out to our Support Team at 866-289-2101.
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Please have a look and let us know if you have any other questions!
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