Pass additional params to OAuth provider to be used in signIn callback

[joneath]

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I need to pass a property (inviteToken) from the frontend's signIn request to the OAuth provider (Google in my case) and then use this property in the backend's signIn callback. As you can see from the method signature of signIn it says the second param will be be passed with the body of the sign-in request:

That seems to only work for the credentials provider...no problem because the third param says it will be passed along as the authorizationParams to the provider. Using this param I can send my inviteToken to Google's side and I see it included in the callbackUrl so I know it's getting passed back to my system but these custom authorizationParams seem to be dropped by Nuxt/Nextjs Auth as the account, credentials, profile, and user objects in the signIn callback don't include my inviteToken. Here in the next-auth repo you can see them working out the temporary solution of using cookies to store any data pre-auth to be used in/post auth. I can easily do this on the frontend but not inside of any of the callbacks of NuxtAuthHandler because we're not provided with the H3 event 😞. Any thoughts on a solution?

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[BracketJohn]

Thanks @joneath for the question + the good description of it + treying out so much already.

Sadly, I cannot get around it right now but will leave it open for others to hopefully share some info. Have you figured out something in the meantime?