The B2B-Suite also adds individual prices for debtors which you can define over the API. You can find them in the swagger.json.
For example if you want to add a price to a product SW10009.
First you get the id of the product from the s_articles_details table. The id is 15 in our case.
With the identifier you are able to fire the API call.
And then you see the price update.