Protected ReadonlyargsRetrieves a DiscountGroup with the provided key.
OptionalmethodArgs: {Checks if a DiscountGroup exists with the provided key.
Returns a 200 status if a DiscountGroup exists, or a 404 status otherwise.
OptionalmethodArgs: { headers?: { [key: string]: string | string[] } }Updates a DiscountGroup in the Project using one or more update actions.
Deletes a DiscountGroup in the Project. This request generates the DiscountGroupDeleted Message.