Order washbasin - Which parts do I need?

Dear bathroom experts,

As part of a special request, we will supply the mineral cast washbasin (for wall mounting) to the sanitary installation company, i.e., procure it independently.
As accessories, we will also provide the wall mounting set.

Is this sufficient as a supply, or do we also need to organize pipes/siphon/drain, etc. in this case..?

Thank you very much and best regards

The plumbing company must say what is enough for them - normally, the drain fitting should also be provided.