~~Opening a draft PR to discuss a couple of implementation details that we should align on~~ **What** Add workflow and API endpoint for creating payment sessions for a payment collection. Endpoint is currently `POST /store/payment-collection/:id/payment-sessions`. I suggested an alternative in a comment below. Please note, we intentionally do not want to support creating payment sessions in bulk, as this would become a mess when having to manage multiple calls to third-party providers.
Payment Module
A Payment is the result of a series of financial transactions performed as part of collecting a payment of a purchase. The Payment holds information about the payment provider as well as the state of it. You can associate a Payment with a Cart, an Order, an OrderEdit, or any other resource you’d like to have your customers pay for.