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Merge Shopify and Faire Sales Data for Inventory Reconciliation

Matching units sold against inventory counts requires the same product and quantity columns across every channel's export.

Why Shopify and Faire 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.
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 inventory reconciliation, 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 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.