Add custom claim to id token

[ABG]

Thanks for the link!
(added to FAQ)

FAQ Section: Firebase

Introductory FireBase Pending Failure Warning - JIS Brief Intro to Cloud Data and the FireBase Component - HAL FireBase component help The firebase console URL is https://console.firebase.google.com/ - @ABG 12/2025 Tutorials Atomic queue and delete - @TimAI2 Simple bulletin board - @TIMAI2 Firebase Chat sample - Amerikashi Firebase bus route tutorial - Romin Irani Firebase Spanish tutorial - kio4 Firebase WhatsAppInventorMIT chat project - Montes FireBase DataChanged Detection from I…