Optionalgtin_Indicate gtin_code validation logic in v2.product.add_itemv2.product.update_itemv2.product.init_tier_variationv2.product.add_modelv2.product.update_model- Mandatory: This field is required and must contain a correctly formatted GTiN number.- Flexible: This field is required and must contain either a correctly formatted GTlN number or "00" todeclare that the item/model has no valid GTlN.- Optional: This field is optional and can contain a correctly formatted GTiN number, "00" or be omittedentirely.
GetItemLimitGtinLimit sub-interface for GetItemLimitResponse