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How to enable Firebase Phone Authentication(OTP)

How to enable Firebase Phone Authentication(OTP)​

1. In Firebase Console, go to Authentication > Sign-in method, enable Phone sign-in, and click Save.​

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2. To add SHA1 and SHA256 keys in Firebase, go to the android folder, right-click the gradlew file, and select "Open in Terminal" as shown in the image below.​

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3. In the terminal view, run gradlew signingReport (on Windows), or ./gradlew signingReport (on Mac/Linux) as shown below.​

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4. Now take debug sha and sha256 will print copy that and add it in firebase console. And also add sha-256 to firebase console.​

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Remember:

  • When releasing the APK, you must add the release SHA1 in the Firebase console; otherwise, OTP verification won't work. After release, you can get the SHA1 from the Play Console under the App Integrity section.

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5. Alternatively, you can get the release SHA using the command line:​

  1. Open Run, type cmd, and press Enter.
  2. Navigate to the Java JDK bin path in the terminal.
  3. Run the following command (replace the keystore path and alias): 
    keytool -list -v -keystore "D:\keystore\eShop.jks" -alias eShop
  4. Enter the keystore password when prompted — it will display your release SHA1.

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6. For ios you need to set following.​

Add custom URL schemes to your Xcode project:

  • Open your project configuration: double-click the project name in the left tree view. Select your app from the TARGETS section, then select the Info tab, and expand the URL Types section.
  • Click the + button, and add a URL scheme for your reversed client ID. To find this value, open the GoogleService-Info.plist configuration file, and look for the REVERSED_CLIENT_ID key. Copy the value of that key, and paste it into the URL Schemes box on the configuration page. Leave the other fields blank.
  • When completed, your config should look something similar to the following (but with your application-specific values):

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