Shop Pay is a payment service designed for Shopify merchants and customers. When you're shopping on a Shopify-powered website and select the Shop Pay option at checkout, the app stores your payment information, shipping address, and payment preferences for future purchases. This way, you can complete future transactions more quickly and with fewer steps. Shop Pay also offers carbon offsets for each delivery, making it a more environmentally-friendly payment option. The app uses encryption to secure your payment information and provides a fast and convenient way to make purchases on Shopify websites.