1. In Google Tag Manager, create a new tag as a custom HTML tag.
2. Inside the tag, paste the entire code from the wpform-datalayer.js file provided in this repository. Don't forget to wrap the code with <script> tag.
3. Set the trigger to fire on All Pages page views.

Once you've configured this setup, you'll begin receiving Google Tag Manager dataLayer events as wpform_submit. You will get form ID as formId and all other form inputs.