ProcessAllowed enables to adjust the ResponseWriter based on the new store ID. The variable newStoreID contains the new ID, which can also be 0. The code is guaranteed to be not empty, a valid store code, and always points to an existing active store. The ResponseWriter and Request variables can be
(runMode scope.TypeID, oldStoreID, newStoreID int64, newStoreCode string, w http.ResponseWriter, r *http.Request)
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