int_nosto_sfra cartridge is also provided but it is not mandatory to use the cartridge as it is just representation of how the cartridge will work with SFRA.int_nosto: app_storefront_controllers: app_storefront_coreint_nosto: app_storefront_baseint_nosto_sfra cartridge before int_nosto to understand what changes are needed in the base cartridge and to understand how the cartridge works. int_nosto_sfra is created just to simulate how the cartridge will work and you have to make sure similar changes are copied over to respective base cartridge as mentioned in the implementation section.