Passing URL Parameters when using Sign up With Google

Hi I am trying to incorporate Sign up with Google into my portal that will also send a url parameter to the User record that is created in Airtable.

New users get to the portal from an affiliate link with a URL parameter that says where they came from. When I make a user with sign up with Google I don’t have the option to pass any parameters. Does anyone have a workaround for this?

The regular sign up page has the capability to prefill with parameters, but I want to incorporate the convenience of google sign on.