How about my favourite Payment Gateway !!
Food Store is an extension to WooCommerce, that means we have used complete WooCommerce functionalities to prepare a page that your restaurant can use. And we have not compromised any WooCommerce functionalities in the process.
You still can use WooCommerce to sell your other items as usual. So that being said, you are free to use any payment gateways that are compatible with WooCommerce including WooCommerce default gateways like COD, Cheque Payment, Direct Bank Transfer and PayPal.