Selling on multiple platforms without inventory conflicts

There are three common multichannel setups:

• Shared assortment — the same products are sold on several channels and draw from the same inventory.
• Independent assortments — each channel carries different products, so no cross-channel identity is required.
• Mixed assortment — some products are shared while others exist on only one channel.

Mixed assortments are normal. A multichannel system should not require every listing to have a counterpart elsewhere.

Each platform has its own connection, catalog, timestamps, and operating behavior. Treating one channel's state as a substitute for another hides useful information.

For each channel, keep track of:

• the latest observed stock, price, and listing state;
• when that evidence was observed;
• whether the channel can still be reached;
• whether the latest collection attempt succeeded;
• what changed since the previous observation.

If several channels share inventory, define which operational system owns the sellable quantity. That may be an inventory system, warehouse system, ERP, or another explicit process.

The channel values then become reported distribution state: useful and important, but not automatically the same thing as physical stock.

GNIZDO observes connected channels independently and keeps their reported catalog state, freshness, changes, and findings reviewable.

For cross-channel item comparison, GNIZDO uses only confirmed shared identity. It never treats equal titles as the same item; an equal SKU counts only when it is exact, unique in every channel, and not contradicted by a different valid GTIN. Everything else waits for the seller to confirm.

GNIZDO is not a universal catalog, warehouse, or automatic cross-channel synchronization system.