Firebase Auth - Phone
To be able to use OTP service in your apps, you need to first enable Phone auth service in your firebase project.
Enable phone authentication on firebase first.
Click on authentication
Click on Sign-in method tab
click on phone then enable it
Authorized Backend To Communicate with firebase
Move the settings tab, scroll to the Authorized domains
Click on Add Domain to add your backend url to the list of authorized domains
Add your backend domain. This is so firebase can allow request from your server.
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