If you are not on Agency, you may upgrade by going to your account billing.
Required account permissions
Custom domain requests must be initiated by users with owner or admin permissions on an Agency account. If you are a sub-user and your account type is user or viewer, you must ask someone with the appropriate permissions to process this request on your behalf.
Custom domain setup
Custom domains require some setup on your end and some setup on Paperform's end.
For your end, you will need to
Create a CNAME record on your desired (sub)domain with the value set to domain.paperform.app.
Navigate to your Account Settings page, and select "Custom Domains" from the sidebar.
Select the button labeled "Add Custom Domain".
Select one of the three options shown at the top of the pop-up window.
Enter your Custom Domain in the "Custom Domain for Your Forms" field, ensuring no HTTP protocols are included (i.e. yourdomain.com and not https://yourdomain.com).
Click "Save", and your domain is ready to go!
Gotchas
Setting the value
Some providers will use "points to" instead of "value" when setting the value of the CNAME record.
Configuring your subdomain on CloudFlare
If you use CloudFlare to manage your domain, use "DNS only" instead of "Proxied" or the custom domain will not work.