Create and manage PriceListVersions.

PricePoints will be created for each Item of each PriceList Product.

PriceListVersion XLSX representation will be fixed for Provider after schedule/activate.

After one of these actions any changes will not affect on XLSX representation for Provider.

For bulk update XLSX file download is needed to set:

• HTTP Content-Type header: application/vnd.openxmlformats-officedocument.spreadsheetml.template

• or add format='xlsx' param to query string (?format=xlsx)