I have read the API docs several times and spoken with support on multiple occasions and cannot get a clear answer on this. Support has directed me here.
I am developing a PRIVATE app for a Shopify store using the Storefront API and would like to complete checkouts within the app (not the Web Url link). I plan to use the Shopify/Stripe integration for this but am open to other options (or even using another API if needed).
Of course, you cannot create a sales channel and request payment processing for an app unless it is a public app available to anyone in the marketplace. So if you do not have a public app, can you use the Buy SDKs for everything BUT processing the payments during checkout? In other words, use the Buy SDKs to do everything except actually Buy anything?