Return one page of the online store's complete catalogue. SKUU reads the whole catalogue this way every 12 hours by default. Each read is a complete snapshot. Only a snapshot that validates from the first page to the last counts.

• Pagination: limit is required and SKUU sends 100. Support 1 to 250 and never return more than requested. cursor is absent on the first request. Return next_cursor while more pages exist and null on the last page. A cursor is opaque; SKUU sends it back as a string. Keep the snapshot stable while SKUU pages through it.
• Completeness: returning null early ends the snapshot early. Every variant missing from a completed snapshot is retired and its network stock set to zero. To remove a product, stop returning it.
• Required fields: every product has product_id, title, brand, at least one public HTTPS image and at least one variant. Every variant has variant_id, size (exactly One size for an article without a size), price, currency and inventory. Send barcode whenever the store has it.
• How SKUU links products: by barcode first, then the store's SKU, then title and size within the same brand. A catalogue with barcodes links almost completely. Colour is stored and shown, never compared.
• What makes SKUU reject a snapshot: a missing brand, image or size, a currency that differs from the store's, a duplicate product_id or variant_id, a product without variants, a variant missing an agreed location or listing an unknown one, a location id that is not a plain whole number, or a number sent as a string. A rejected snapshot changes nothing; the previous one stays in force.
• Retries: SKUU retries a network failure, 429 and any 5xx; the schedule is on Errors and retries. Any other 4xx stops the flow and alerts SKUU customer service.