-ActiveCampaign API Url: Enter your ActiveCampaign API Url.
-ActiveCampaign API Key: Enter the ActiveCampaign API key. API key is visible on your ActiveCampaign dashboard.
Go to Forms and edit one of your Forms. On the tab click on Settings => Form Actions.
Add the ActiveCampaign Action & select list & map activecampaign fields with a form fields.
That’s it .. Now when you submit the form it will add new contact in ActiveCampaign.