Returns every product-group promotion defined on this instance. Promotions are configured in Winshop and applied automatically when a price is resolved; these endpoints read that configuration. Requires `Permissions.Promotions.View`.

Get a product-group promotion

Returns one product-group promotion by `id`. Requires `Permissions.Promotions.View`.

Update a one-time barcode discount PUT

Replaces the one-time barcode discount identified by `id` and returns the stored row. Requires `Permissions.Promotions.Update`.

List product-group promotions GET

Returns every product-group promotion defined on this instance. Promotions are configured in Winshop and applied automatically when a price is resolved; these endpoints read that configuration. Requires `Permissions.Promotions.View`.