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Merge Walmart Marketplace and Facebook Marketplace Sales Data for Bookkeeping

Bookkeepers reconciling multi-channel sales need one consistent set of columns per month, not a different layout per platform.

Why Walmart Marketplace and Facebook Marketplace exports don't line up

Walmart Marketplace: an Order Date column separate from the ship-by date; item price and a separate Walmart referral fee; a numeric Purchase Order ID. Also, each order line can appear as its own row with a repeated order ID, similar to Shopify's line-item export.
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.

For bookkeeping, 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 Walmart Marketplace export and map its columns once.
Drop in your Facebook Marketplace 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.