Hello user694393,
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.
Yes, contacts must still be added to lists, and email campaigns can only be sent to lists of contacts, rather than to individual contacts. This is the same both within the Website UI as well as via the API.
Our system isn’t really configured to send individual emails, as Constant Contact is built primarily for sending bulk emails to lists of contacts, and sending a large amount of emails to lists that only contain one contact could potentially make viewing campaign reporting and statistics cumbersome.
Please have a look and let us know if you have any other questions!
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