Hello glowup1,
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.
Constant Contact's V3 API is made available so that 3rd party developers can create integrations to sync account data between Constant Contact and other services.
Creating a Shoppable Landing Page, which is the ecommerce solution offered by Constant Contact, is done directly through the Website interface and is unrelated to the API.
I have included the links to some articles below that relate to creating a Shoppable Landing Page through Constant Contact:
Create an online store to connect to a Shoppable Landing Page or website created with Constant Contact’s Website Builder
Create a Shoppable Landing Page to sell goods and services
Create a website through Constant Contact
If you need further assistance with the information in the articles above, the contact information for Email & Digital Marketing Support, as well as Website Builder Support can be found here:
Constant Contact Help & Support
https://community.constantcontact.com/t5/Contact-Support/bd-p/contact-support
Support Tips
"There's a multitude of ways to engage your audience through us using your social platforms - via ads, social post metrics, email links, and more! " - Will
See ArticleSupport Tips
"Target your most engaged contacts by creating a segment. Create a special offer or show your appreciation!" - Caitlin
See ArticleSupport Tips
"Greet new contacts with one or more automated Welcome Emails depending on their interests or your business goals." - Nick
See Article