Hello JohnW0157,
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.
While we do not have any API Endpoints or Developer tools available for SMS features, Constant Contact is now offering a new SMS Marketing tool:
About Constant Contact’s SMS tool (beta)
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/45188-About-Constant-Contacts-SMS-tool
Register for SMS marketing in your account (beta)
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/45189-Register-for-SMS
For more information regarding (and/or assistance with) this feature, please reach out to Constant Contact’s support team by phone at 866-289-2101.
Please have a look and let us know if you have any other questions!
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