> This page is for Afterpay Online Developer, version Main (default).
> For other versions, use one of these documentation indexes:
> - Main (default): https://developers.afterpay.com/afterpay-online-developer/main/llms.txt
> - v1: https://developers.afterpay.com/afterpay-online-developer/v-1/llms.txt
> - Chinese: https://developers.afterpay.com/afterpay-online-developer/chinese/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developers.afterpay.com/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developers.afterpay.com/_mcp/server.

# Add Cash App Pay at Checkout

Cash App Pay is a fast and simple payment method that lets customers pay for purchases either by scanning a simple QR code or by tapping Cash App Pay at checkout to be redirected to Cash App.

You can use your existing Afterpay integration to enable this feature, and it works on Desktop, Mobile, and in a native app.

**Prerequisites**

Before you integrate Cash App Pay into Shopify ensure that you are:

* An existing Afterpay merchant on Shopify with a proven integration

* A US merchant

> **Note**
>
> Cash App Pay will be another payment option in your payment page alongside Afterpay. It will *not* be just a tender type within an Afterpay payment.

## Overview

The Cash App Pay integration process can be completed in three stages:

* [Download the Cash App Pay payment application](#download-the-cash-app-pay-payment-application)

* [Connect your Account](#connect-your-account)

* [Final Confirmation and Activation](#final-confirmation-and-activation)

> **Warning!**
>
> You must use your Afterpay Production Merchant ID and your Afterpay Production Secret Key in the Cash App Pay integration process. Your Sandbox credentials will not work for account activation, even if you are in a Sandbox environment.

## Download the Cash App Pay payment application

1. Go to the [Cash App Pay](https://apps.shopify.com/cash-app-pay) page on the Shopify App Store.

2. Login to Shopify

3. Download the Cash App Pay application. The Install app screen appears. See the picture below:

![cap-shop-payment-app-activation-1.png](/_fern-img/1206bd1804eb1a8c153ebe1877343bb7f7af30d4f1e9cce3afb4efcf3fe41b5c.webp)

4. Shopify asks you to grant Cash App Pay (Afterpay) permission to *View personal data* and *View and edit store data*. Click **Install** to continue.

## Connect your account

To connect your account, do the following:

1. After downloading and installing the Cash App Pay app, from the following screen, click **Connect to Cash App Pay**.

![cap-shop-payment-app-activation-2.png](/_fern-img/8406d90412f1c08d1e2464fc3cc6aff53de81d2c7ae71ff7263382f35c98fd0b.webp)

2. The *Connect to Cash App Pay* screen appears:

![cap-shop-payment-app-activation-3-small.png](/_fern-img/aea220c2820778681188982d80083d9fa4c6300a9b6dbe75edcf625b70b2c0e0.webp)

3. Enter your Afterpay production merchant ID in the **Merchant ID** field.

4. Enter your Afterpay production secret key in the **Secret Key** field.

5. Click **Continue**.

> **Warning!**
>
> In step 3 above, you must use your Afterpay **Production** merchant ID. In step 4 above, you must use your Afterpay **Production** secret key. Your Sandbox credentials **will not work** for account activation, even if you are in a Sandbox environment.

## Final Confirmation and Activation

After you click **Continue** in Step 5 above, you are redirected to the following page for final confirmation:

![cap-shop-payment-app-activation-4-small.png](/_fern-img/a24c5c74548a849163b1a3780000566c25a163de2d177c182b22ed535aed5d21.webp)

Do the following:

1. Ensure the *Cash App Pay* toggle switch is enabled (black).

2. Ensure *Test Mode* is off (grey).

3. Click **Activate**.

Your customers should now have Cash App Pay available as a payment method at checkout.

![Shopify-payment.png](/_fern-img/f70308042798b27714e4759f0bd69428a5112064c3b17d3d83d32bae26d712d0.webp)