secret.gradle

ext {

    // modify the apiKey and clientPrefix

    apiKey = "YOUR_API_KEY"

    clientPrefix = "YOUR_CLIENT_PREFIX"

    // google identity service

    discoveryEndpoint = "https://accounts.google.com/.well-known/openid-configuration"

    authorizationEndpoint = "https://accounts.google.com/o/oauth2/v2/auth"
    tokenEndpoint = "https://www.googleapis.com/oauth2/v4/token"
    userInfoEndpoint = "https://www.googleapis.com/oauth2/v3/userinfo"

    // google identity client

    clientId = "${clientPrefix}.apps.googleusercontent.com"
    redirectScheme = "com.googleusercontent.apps.${clientPrefix}"
    redirectUri = "com.googleusercontent.apps.${clientPrefix}:/oauth2redirect"

    authorizationScope = "openid email profile https://www.googleapis.com/auth/books"

    // client keystore

    secret = "secret"

    keystore = "${secret}.keystore"
}