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PHP 7.3 reached end of support in December 2021 and Adobe Commerce 2.3.x reaches end of support in September 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.
The Magento_OfflineShipping module implements the shipping methods which do not involve a direct interaction with shipping carriers, so called offline shipping methods. Namely, the following: