Bitrix. How to set a limit for the warehouse delivery service?

Question

1C-Bitrix

There is an OZONE delivery service (incl. courier, PVZ, postamat), it is necessary that this service be shown only if the goods that are in the order process are in a certain warehouse.

I found a suitable article , but I don’t understand how to put it more organically in the warehouse.

Do I understand correctly what is needed in extractParams
1. get the goods
2. check them in warehouses
3. If they are in the right warehouse, what should I return? Or if they are not there, what to return?

Or maybe there is an easier way?