Custom 3rd party registration form

we have built a 3rd party registration form for our software and would like to capture user information into activecampaign via API

any tips or links to specific references on how to do this?

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I have the same challenge. The website I am working for uses a custom HTML form. How to send that form data to Activecampaign. I thought that this is a common situation but seems that the internet doesn’t know a solution.

we ended up using the API and was able to add the user who submitted the form into the contact list and add a tag to the contact.