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Use this guide to execute a transaction with Google Pay after you have a connected customer. See the Going Live section for details on the requirements you must meet before you can take this integration to production.

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Prerequisites

  • A connected customer (via client.getConnection() or client.connect()).
  • A UI surface where you can render the Google Pay frame.
You can test the Google Pay flow using test mode. Test mode uses simulated payments and testnet blockchains so no real assets are transferred.

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Display payment methods

Use the SDK or API to fetch and display the payment methods that are available for the customer right now. 
// After connecting, list available payment methods
const paymentMethodsResult = await client.getPaymentMethods();

if (!paymentMethodsResult.ok) {
  // Handle error
}

console.log(paymentMethodsResult.value);

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Get quotes

Quotes provide real-time prices and fees for transactions. Present detailed quotes in your UI using data from the SDK or API. Only quotes with executable: true can be used to execute a transaction. See the quotes API reference for the fields required to receive executable: true. 
const quoteResult = await client.getQuote({
  source: "USD", // The fiat currency for payment
  destination: "ETH", // The crypto the customer will receive
  sourceAmount: "100.00", // The amount to purchase
  walletAddress: "0x1234...", // The destination wallet address
  paymentMethod: "google_pay", // The payment method type
});

if (!quoteResult.ok) {
  // Handle error
}

console.log(quoteResult.value);

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Execute the transaction

To execute a transaction, set up the payment flow based on the quote. Different payment methods have different requirements—you can configure each as needed to control your experience. For the frame URL, size, permissions, and events, see the Google Pay frame reference.
Some transactions require a challenge — the Google Pay frame emits a challenge event when extra verification is needed. See Handle challenges for the full flow.
Google Pay
import type { GooglePayEvent } from "@moonpay/platform";

// Render the Google Pay frame into your UI and handle callbacks
const googlePayResult = await client.setupGooglePay({
  quote: quoteResult.value.signature, // The quote signature from getQuote

  container: document.querySelector("#googlePayContainer"), // DOM element to render the button

  onEvent: (event: GooglePayEvent) => {
    switch (event.kind) {
      case "ready":
        // The frame is ready. Use this event to reveal the button if needed.
        break;

      case "complete": {
        const txn = event.payload.transaction;

        if (txn.status === "failed") {
          // The transaction failed. Branch on failureCode for programmatic handling.
          switch (txn.failureCode) {
            case "authorizationDeclined":
              // Prompt the customer to try a different card.
              break;

            case "serviceUnavailable":
              // Retry after a short delay.
              break;

            default:
              // Show txn.failureReason to the customer.
              break;
          }
          break;
        }

        // The transaction is executing. Track the final status via polling and/or webhooks.
        console.log(txn);
        // { id: "txn_01", status: "pending" }
        break;
      }

      case "challenge":
        // Verification required. Render the challenge frame at the provided URL.
        // See: /platform/guides/handling-challenges
        console.log(event.payload.url);
        break;

      case "quoteExpired":
        // Fetch a new quote, then pass its signature into the frame
        // const newQuote = await client.getQuote({...});
        // event.payload.setQuote(newQuote.value.signature);
        break;

      case "error":
        // Depending on the error, you can have the customer pick a different payment method or retry.
        console.error(event.payload.message);
        break;

      case "unsupported":
        // Google Pay isn't supported in the current environment.
        break;
    }
  },
});

if (!googlePayResult.ok) {
  // Handle error setting up Google Pay
}

// You can update the quote or dispose the frame later
// googlePayResult.value.setQuote(newQuoteSignature);
// googlePayResult.value.dispose();

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Transaction statuses

Transactions have the following statuses:
  • Pending: The transaction has been initiated and the payment accepted. The assets are being transferred.
  • Complete: The transaction is finalized. The payment is complete and the assets have been delivered to their destination.
  • Failed: The transaction has failed. The payment was not executed and funds were not transferred.