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PHP 7.3 reaches end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in April 2022. You may want to consider planning your upgrade now to Adobe Commerce 2.4.x and PHP 7.4.x to help maintain PCI compliance.

Checkout

Magento\Checkout module allows merchant to register sale transaction with the customer. Module implements consumer flow that includes such actions like adding products to cart, providing shipping and billing information and confirming the purchase.