I am using firebase phone auth for the very first time and I see captcha verification is must proceed with the process, as per firebase official documentation. Though it ser
firebase.initializeApp(firebaseConfig);
// Create a Recaptcha verifier instance globally
// Calls submitPhoneNumberAuth() when the captcha is verified
window.recaptchaVerifier = new firebase.auth.RecaptchaVerifier(
"recaptcha-container",
{
size: "invisible",
callback: function(response) {
submitPhoneNumberAuth();
}
}
);