If you want users of your application to be able to buy your product via mobile phone, you need to configure the cart in the application using the "Cart" module.
To turn it on, you just need to click on it.
If you want to add your delivery method you need:
If you want to add your payment method you need:
To remove the added delivery / payment method, just click on the urn icon opposite the desired method.
Also, you can remove the display in the application of an unnecessary delivery / payment method by unchecking the box "Available in the application?". But note that at least one delivery / payment method must be included.
If necessary, you can disable the "Cart" module.
A message appears stating that you are sure that you want to disable the "Cart" module in the application. And accordingly you must choose: