How to integrate Auth API in opencart admin and in fronend end user will add their email and submit then it will save in Contact contact Form.
Right now i am using OAuth2 for achive this but not getting idea which steps we need to follow and what to store in admin side for smooth flow for end user.
Please suggest and help me out.
Thank you for reaching out to Constant Contact API Developer Support and for your patience. My team is here to assist outside software developers with questions about building into Constant Contact's API.
If you're building your own integration/form, here are some of the endpoints that you can call in regards to contacts:
Bulk Activity Endpoint for Importing Contacts:
Endpoint for Creating or Updating a Contact
If needed, you may be able to find a front-end form in the OpenCart Extension Store: