Car garage / repair shop - wholesaler api integration

I would like to exchange knowledge about integrating a wholesaler api for a car garage shop. In Germany we have mostly 3 identifiers (hsn, tsn, kba) to match car parts to a vehicle. The shop creates a customer and puts in the hsn tsn combination, then the mechanics get only parts for the specific vehicle and the incoice gets the parts description and price from the generated list. Parts dealer is wacker & döbler, they sent me the api reference.