I am working on a custom mobile app platform for some of our exclusive products. We do not want to list these products under Shopify products listing. However, I would like to collect payment for orders placed on the mobile app for these unlisted products on Shopify.
In other words, we would like to use Shopify as payment gateway for these unlisted products. Just by-passing order specific details like order amount, description and may be an identifier to map and track payment status later. Can you please guide me in the right direction as to which API / service should we implement in our mobile app (Expo framework) to get this behavior?
Please note that cart will be managed within the app, once they click on check-out, I would like to redirect/process customers under Shopify Payment flow with order specific details (like mentioned above: Amount, Description and Unique ID)