TnetDev_CustomizeCheckout master branch is empty magento2 module. the source code archives is stored in the named branches. for example: magento2sample-shipping-provider customization-11-add-custom-fields-that-influence customization-10-add-custom-shipping-address-renderer customization-09-add-new-field-in-address-form customization-02-customize-the-view-of-a-checkout-step customization-01-add-new-checkout-step