Retrieves multiple brands by name, or creates multiple brands if those with the passed brandNames don't exist.
Note: results.item always contains the full brand entity for each retrieved or created brand. Bulk Get Or Create Brands doesn't accept a returnEntity parameter.
You can only call this method when authenticated as a Wix app or Wix user identity.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.