POST https://www.googleapis.com/identitytoolkit/v3/relyingparty/getAccountInfo?key={FIREBASE_SERVER_KEY} { “idToken”: “eyJhbGciOiJEanNZspytaJL4wDZmu2OcwQujC360AJ_Q” } //result { …, “users”: [ { …, “phoneNumber”: “+351966666666”, … } ] }