Generates a Microsoft Merchant Center catalog feed from your OpenCart 4 catalogue as tab separated values with Microsoft's own column names: Item Id, Title, Final URL, Image URL, Price, Sale Price, Brand, GTIN, MPN, Condition, Availability and Product Category. TSV has no quoting, so every value has its tabs, carriage returns and line feeds collapsed to single spaces before the row is assembled and each row is written with exactly twelve columns. Identifiers are read from OpenCart 4.1's product_code table and from the legacy product columns, whichever the schema actually has, with GTIN falling back through EAN, UPC, JAN and ISBN and MPN falling back to the product model. Specials come from product_discount rows, prices are written as "12.34 USD" in the feed currency and can include tax, and products are read from the database in batches of 250 straight to a temp file that is atomically renamed, so large catalogues do not exhaust memory. The feed route is guarded by a token and returns 404 without it. Creating the store and scheduling the import happens in Microsoft Merchant Center.