firestore-liqpay-node-client

This package helps you integrate your Firebase Cloud Functions app with the firestore-liqpay-payments extension. It simplifies all the usual Firestore queries and other database operations needed to use the extension. Additionally, it offers type definitions for all the common object types used by the extension during payment processing.

Example usage

Initialize the Client

Ensure you have initialized the Firebase Admin SDK as described here.

Then create a new instance of the FirestoreLiqpayClient class and configure the client to use the same Firestore collections you configured the extension to use.

import { FirestoreLiqpayClient } from "firestore-liqpay-node-client";
const client = new FirestoreLiqpayClient({
  // The name of the Firestore collection where invoices are stored, it should 
  // match the value of the `INVOICES_COLLECTION` parameter you set when 
  // configuring the extension.
  invoicesCollection: "invoices", 
  // The name of the Firestore collection where checkout sessions are stored, 
  // it should match the value of the `SESSIONS_COLLECTION` parameter you set
  // when configuring the extension.
  sessionsCollection: "sessions",
});

Place a new invoice to initiate a payment

To place a new invoice and initiate a payment, call the placeInvoice method on the PaymentsClient client instance. The method returns a CheckoutSession object that contains the URL of the payment page where the user can complete the payment.

const client = FirestoreLiqpayClient.createDefault();

// Invoice here is your custom object that you use to track the payment, 
// it could be an order object or any other object that you want to associate
// with the payment.
const invoice = createInvoice();

try {
  const invoiceId: string = 
    await client.payments.placeInvoice(invoice.toDatabaseObject());
  console.log("Invoice placed successfully", invoiceId);
} catch (error) {
  console.error("Failed to place invoice", error);
}

Wait for the Checkout Session to be created

Ensure that the waitForCheckoutSession method is called in a different Node.js event loop iteration after placing the invoice. This is because the firestore-liqpay-payments extension listens to Firestore events that trigger after the invoice is placed and the event loop is freed up.

const client = FirestoreLiqpayClient.createDefault();

try {
  const session: CheckoutSession = 
    await client.payments.waitForCheckoutSession(invoiceId);
  // Redirect the user to the payment page URL to complete the Checkout
  console.log("Payment Page URL:", session.paymentPageURL);
} catch (error) {
  console.error("Failed to find checkout session", error);
}

Dependencies

• Firebase Admin SDK (firebase-admin)