post
https://api-sandbox-revel.revelup.com/resources/ProductModifierClass/
Successful operation
Bad request. Usually not valid data provided.
Authorization required
Message: Integrity Error - one of the fields provided did not pass validation. Note that: both "ModifierClass" and "Product" should exist and have the same "EstablishmentId" and unique combination of "ModifierClass" and "Product" should be provided