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Merge eBay and Poshmark Sales Data for Spreadsheet Automation

Automating a recurring sales spreadsheet breaks the moment a platform's export headers don't match what the automation expects.

Why eBay and Poshmark exports don't line up

eBay: Sale Date shown in the seller's local time; item subtotal, shipping, and final value fee as separate columns; an Order Number that can bundle multiple items bought together into one row. Also, the seller hub export format changed more than once, so column names can differ depending on when the report was generated.
Poshmark: a sale date in the seller's local time; listing price and the Poshmark commission shown separately; an order number tied to a single sold item, since bundles are the main exception. Also, the export is aimed at individual resellers, so it has far fewer columns than the bigger platforms and no shipping/tax breakdown.

For spreadsheet automation, that mismatch is exactly what causes hours of manual cleanup every period.

Open CSV Experts and set your target columns once (Date, Channel, Order ID, Total).
Drop in your eBay export and map its columns once.
Drop in your Poshmark export and map it the same way — both merge into one sheet, normalized.
Export as CSV or Excel. Same-layout files merge automatically next time.

No. Everything runs in your browser using JavaScript — your files are never sent to a server.

Yes. Add as many source files as you want; each distinct file layout is mapped once and remembered.