The following result is obtained by our Internet Research Algorithm:
Supplier API name is Pos_vendor_Pub_Pkg, there are multiple procedures in it for different purposes -
To create a new vendor or supplier
To create a vendor site or address.
To create vendors contact details.
If you want to create a supplier from front-end then you will need an ERP (Enterprise resource planning) environment. So to make it work via API, you have to create an environment from backend also by app initialise.
You have to define the required field and optional field for suppliers.
When you run API there will be out parameters, API will return values.