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Merge Facebook Marketplace and Reverb Sales Data for Xero Import

Xero's bank/sales import works best with a single uniform sheet, which is hard to get directly from two different platforms' raw exports.

Why Facebook Marketplace and Reverb exports don't line up

Facebook Marketplace: an order date recorded through Meta's commerce backend; item total and a Meta selling fee where checkout is enabled; an order ID formatted differently depending on whether Shop Pay or Meta Pay processed the transaction. Also, many sellers use Marketplace only for listings with no built-in checkout, so exports may only exist via a connected store's own platform.
Reverb: an order date column specific to the marketplace's order dashboard; item price, shipping, and Reverb's selling fee as separate columns, often with international currency conversion involved; an order number distinct per listing sold. Also, used mostly for musical instruments/gear, so price ranges and shipping costs vary far more per row than typical retail exports.

For xero import, 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 Facebook Marketplace export and map its columns once.
Drop in your Reverb 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.