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.
Our V3 API doesn’t currently offer an endpoint for the QuickSend feature available in the Website UI, however, there are certain ways that you could work around this by using the V3 API in combination with an HTML Custom Code email template sent to a specific list on a schedule using custom contact fields.
You can use the same html used to create the initial email (though you would need to give it a different unique campaign name) and use the same process below to send an email with the same content to the same recipient.
I’ll list some steps below showing how you might configure something like that:
In the following example, you’d take that contact data and use the API to add those contacts to a designated list.
Step 1: Create the HTML code for your Custom Code email template.
[Designing HTML for Custom Code Emails]
Step 2: Use your template code to create an email draft.
[Create an Email Campaign]
Step 3: Create a list for use with your integration.
[Create a List]
Step 4: Add the desired contact to the list you created
[Bulk Activities - Import Contacts]
Step 5: Send your email to the list we created.
[Schedule an Email Campaign]
Step 6: After the email has sent, clear the list so it can be used again for the next send.
[Remove Contacts from Lists Bulk Activity]
Step 9: Repeat steps 4-9 to send out your individual emails as needed.
Additionally, you can utilize our API Reference Page to find body schemas & values, as well as test the functionality of our available endpoints to see how they will work once programmed within your application:
Please have a look and let us know if you have any other questions!