OTP verfication using Firebase .
Reference : https://firebase.google.com/docs/auth/android/phone-auth
Getting Started
The easiest way to get started is to clone the repository:
Step 1 : Create a project in firebase console.
Step 2 : Enable Phone Sign-in providers under Authentication Sign-in method.
Step 3 : Download google-service json from firebase console and paste inside app folder in project.
Step 4 : Run the project and verify your OTP.