I already have a developer store with my app installed, the correct access scopes, I can read product listing, etc.
The main problem is that I can find a way to test the payment flow using the Checkout API through Stripe connect. I don't want to use a Production Stripe data, so I create a Stripe account for testing porpouse.
Step to reproduce:
1- Customer initiates checkout.
2- My app create the checkout.
3- As it says here Shopify must return a shopify_payments_account_id but always return null.
From this point a miss the flow. Some example would also be very useful.
So, summarizing, what I need is to complete the checkout, tokenize the customer card info and complete the payment flow.