Hello AlanJ7943,
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.
Everything that you mentioned is definitely possible with Constant Contact. Contact lists can be created or deleted at any time. In terms of the example you provided with all new customers receiving an offer email once and then continuing to receiving other relevant event driven emails, you could utilize an automated email series with a list-join trigger. Once a contact is added to a list connected to an automated series in this way, they would receive a series of emails that you add in the order and delay periods that you configure in the series settings. Below I’m including a detailed support article with more information about automated email series:
Create an Automated Email Series:
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/27935-Choosing-a-Trigger-for-Your-Automated-Email-Series
In terms of our API, you could utilize various endpoints to add or delete contacts and contact lists. Below I’m including a quick start guide for our V3 API as well as our documentation on some of these endpoints.
V3 API Quick Start Guide:
https://developer.constantcontact.com/api_guide/getting_started.html
Import Contacts Using a CSV File:
https://developer.constantcontact.com/api_reference/index.html#!/Bulk_Activities/contactsCSVImport
Import Contacts Using JSON Payload:
https://developer.constantcontact.com/api_reference/index.html#!/Bulk_Activities/bulkImportContactsJSON
Delete Contacts in Bulk:
https://developer.constantcontact.com/api_reference/index.html#!/Bulk_Activities/postContactDelete
POST (Create) a List:
https://developer.constantcontact.com/api_reference/index.html#!/Contact_Lists/createList
Delete a List:
https://developer.constantcontact.com/api_reference/index.html#!/Contact_Lists/deleteListActivity
Please have a look and let us know if you have any other questions!
Regards,
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