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Firebase mobile payments: Android & iOS with Cloud Functions for Firebase

This example includes Firebase Cloud Functions to create payments in native Android and iOS (coming soon) applications.

Features:

• Android client
• iOS SwiftUI client
• Functions
  • Create a customer object when a users signs up via Firebase Authentication and add a customer entry to Cloud Firestore: createStripeCustomer
  • Callable functions to create a short-lived ephemeral keys for the SDK's prebuilt UI components: createEphemeralKey
  • Function to create a PaymentIntent when a new payment doc is added to Cloud Firestore: createStripePayment
  • Webhook handler function to keep Cloud Firestore in sync with Stripe: handleWebhookEvents
  • When a user is deleted from Firebase Authentication, delete thir data in Cloud Firestore and their customer object in Stripe: cleanupUser

Video tutorial: Android

Recommended usage

Please note that when selling digital products or services within your app, (e.g. subscriptions, in-game currencies, game levels, access to premium content, or unlocking a full version), you must use the app store's in-app purchase APIs instead. See Apple's and Google's guidelines for more information.

Deploy and test

• Create a Firebase Project using the Firebase Developer Console
• Enable billing on your project by switching to the Blaze or Flame plan. See pricing for more details. This is required to be able to do requests to non-Google services.
• Enable Google & Email sign-in in your authentication provider settings.
• Install Firebase CLI Tools if you have not already and log in with firebase login.
• Configure this sample to use your project using firebase use --add and select your project.
• Install dependencies locally by running: cd functions; npm install; cd -
• Add your Stripe API Secret Key to Firebase config:

  firebase functions:config:set stripe.secret=<YOUR STRIPE SECRET KEY>

• Deploy your project using cd functions; npm run deploy; cd -

Setting up webhooks

• Run firebase open functions to open the Firebase console.
• Copy the URL for the handleWebhookEvents functions (e.g. https://region-project-name.cloudfunctions.net/handleWebhookEvents)
• Create a new webhook endpoint with the URL in the Stripe Dashboard
• Copy the signing secret (whsec_xxx) and add it to Firebase config:

  firebase functions:config:set stripe.webhooksecret=<YOUR WEBHOOK SECRET>

• Redeploy the handleWebhookEvents function: firebase deploy --only functions:handleWebhookEvents

Accepting live payments

Once you’re ready to go live, you will need to exchange your test keys for your live keys. See the Stripe docs for further details.

• Update your Stripe secret config:

  firebase functions:config:set stripe.secret=<YOUR STRIPE LIVE SECRET KEY>

• Set your live publishable key in your respective client integration.
• Follow the Setting up webhooks from above for live mode.
• Redeploy the functions for the changes to take effect cd functions; npm run deploy; cd -.

Authors

• @shengwei-stripe
• @thorsten-stripe