Hello MDFM,
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 system isn’t really configured to send individual emails like that, 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.
However, if you are planning on building your own application for integration using our free V3 API, 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.
Additionally, while there is no way to emulate the "Quick Send" feature that is available via the Website UI, 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]
https://v3.developer.constantcontact.com/api_guide/design_code_emails.html
Step 2: Use your template code to create an email draft.
[Create an Email Campaign]
https://v3.developer.constantcontact.com/api_guide/email_campaign_create.html
Step 3: Create a list for use with your integration.
[Create a List]
https://v3.developer.constantcontact.com/api_guide/lists_overview.html
Step 4: Add the desired contact to the list you created
[Bulk Activities - Import Contacts]
https://v3.developer.constantcontact.com/api_guide/import_contacts.html
Step 5: Send your email to the list we created.
[Schedule an Email Campaign]
https://v3.developer.constantcontact.com/api_guide/email_campaign_create_schedule.html
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]
https://v3.developer.constantcontact.com/api_guide/remove_list_membership.html
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:
https://v3.developer.constantcontact.com/api_reference/index.html
In regards to fonts, if you opt to create Custom Code HTML emails (either via the website UI or the API), you do have the option to use a font of your choosing, however, if the font chosen is not supported by the browser or the email client of the recipient, then it will revert to whatever the default is for the person viewing it. Due to this, it is better to use the fonts that are provided.
Email-safe and web-safe font selections in emails
https://knowledgebase.constantcontact.com/articles/KnowledgeBase/5877-web-safe-font-selections-in-campaign-emails
V3 API - Designing HTML for Custom Code Emails https://v3.developer.constantcontact.com/api_guide/design_code_emails.html
Please have a look and let us know if you or your developers have any other questions!
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