The 2nd portion is the particular identifier. We suggest separating the ICD as well as identifier with a colon character (U+003A). Typical ICD values contain: A certain style of return payment Should the product is returned due to customer remorse. See returnFees for possible values. Assists in Search engine marketing. https://google-merchant-id68890.ourabilitywiki.com/9326101/json_schema_shopify_fundamentals_explained