Unable to persist query param (ref) in Post User Registration Action

Get Help
,
1

I’m trying to pass a ref query parameter during signup using loginWithRedirect({ authorizationParams: { screen_hint: "signup", ref: "xyz" } }), and I want to access that flag in the onExecutePostUserRegistration action.

I tried this code:

js

CopyEdit

exports.onExecutePostUserRegistration = async (event, api) => {
  const ref = event.request.query?.ref;
  if (ref) {
    api.user.setUserMetadata("ref", ref);
  }
};

But it looks like event.request.query is undefined or doesn’t include the query string. I suspect the ref param doesn’t survive the email verification link.

What’s the recommended way to pass a referral flag or other custom data through the signup process and access it in the Post User Registration Action?

I want to avoid a database or session store unless necessary.