If you want to add apple pay to cash app from apple wallet. Firstly, you should touch the Money Card tab on the main screen of the cash app. Secondly, Touch your money card image. Select add to apple pay. Follow the steps. However, To add a Cash Card to Apple Pay from Apple Wallet: Open your Apple Wallet and tap +. Follow the steps. Open the Cash app to make sure your money card has been added. Although, you can visit our website to learn more about the cash app.