tipsi-stripe/example/android/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com/"
            name "Google"
        }
    }
    dependencies {
        classpath "com.android.tools.build:gradle:3.0.1"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        // Add jitpack repository (added by tipsi-stripe)
        maven {
            url "https://jitpack.io"
        }
        maven {
            url "https://maven.google.com"
            name "Google"
        }
        mavenLocal()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
        }
    }
}