Marketplace Connect Error Resolution

My Shopify store relies on the Marketplace Connect app to keep listings on Amazon and eBay in sync, but I’m running into a mix of syncing failures, listing errors, and inconsistent data that keep creeping back in. Some SKUs never update correctly, others show phantom quantities, and a few refuse to publish at all—even though the data looks fine inside Shopify. These glitches appear equally on Amazon and eBay, so I’m looking for someone who already knows Marketplace Connect inside out and won’t need a learning curve.

Here’s what I need done:

• Audit the current Marketplace Connect configuration and pinpoint every cause of the syncing, listing, and data-mismatch issues that are stalling or corrupting updates.
• Fix those root problems so product descriptions, pricing, and inventory stay aligned across Shopify, Amazon Seller Central, and eBay Seller Hub.
• Clean up any remnants of past failed uploads or duplicate ASIN/SKU links so catalog integrity is restored.
• Push new products—each with a valid UPC—into the Amazon catalog smoothly, confirming they attach to the correct ASINs or create new ones when required.
• Validate that future edits in Shopify propagate reliably to both marketplaces without manual intervention.

I’ll measure success when a full catalog sync runs without errors, new items appear on Amazon and eBay within expected timeframes, and test edits to price and stock reflect accurately on all three platforms.

If you’ve already untangled these exact Marketplace Connect headaches for other sellers, let’s talk.