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Merge Shopify and Reverb Sales Data for Multi-Store Reporting

Reporting on multiple storefronts only works cleanly once every store's export uses the same column layout.

Why Shopify and Reverb exports don't line up

Shopify: a Created At timestamp that includes a timezone offset; a single Total column that already nets out discounts, with tax broken out separately; an order Name like #1001 rather than a numeric ID. Also, exports one row per line item by default, so an order with 3 products becomes 3 rows unless you export the summary report instead.
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 multi-store 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 Shopify 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.