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Merge eBay and Faire Sales Data for Sales Tax Reporting

Sales tax reporting needs order totals broken out consistently by date and location, which rarely matches between two platforms' raw exports.

Why eBay and Faire 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.
Faire: an order date shown alongside a separate ship date for wholesale orders; wholesale unit price plus a Faire commission column, distinct from retail-style totals; an order number tied to a retailer account rather than an individual consumer. Also, quantities are per case/pack rather than per unit, which throws off totals if merged as if it were a retail export.

For sales tax reporting, 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 Faire 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.