the technical requirements say "Your app must use the Checkout API to process payments, and it must be PCI compliant". so I'm wondering, can this allow merchant to still choose their own payment methods such as 'Delivery by Cash' or similar? Thanks!
one more word - I asked this question because my sale channel app doesn't want to take any credit card info or any money concern, so I want the merchant's shopify store to handle all the payment things using the returned web_url from the Checkout API. Not sure if this idea is allowed for sales channel app?
That's exactly what I would be interested in. Is it possible to develop a sales channel app where payment processing is done entirely through the marketplace platform and this is only marked as payment through the API in Shopify?