This API is subject to change. Bug fixes and new features will be released based on developer feedback throughout the preview period.
Note: The Item Modifier Groups API only works with the Wix Restaurants Menus (New) app. Make sure you downloaded this app from Wix App Market.
Updates a modifier group. Each time a modifier group is updated, revision increments by 1. The existing revision must be included when updating the modifier group. This ensures you're working with the latest modifier group information, and it prevents unintended overwrites.
You can only call this method when authenticated as a Wix app or Wix user identity.