Contact experienced integrators at
https://1b.app/ru/partner/onebox-corp/, they will be able to help you with pricing and consulting on the fields of the product card. Most likely, in a couple of hours you will be able to agree on the task you want to complete and implement it with integrators. Unfortunately, in a couple of messages I won’t be able to help you set up the system correctly, I can only point you in the right direction, and transfer via API, integration with another site, creating markups on prices or RRPs is a very complex task, for which it is better to turn to specialists, who do this every day.