Shopify pays out in batches, net of fees and refunds, but most books post sales day by day. They rarely line up, and a small leftover balance can hide a dropped refund or duplicate entry, not just normal timing lag. Payout Proof checks every payout against Xero nightly, to the cent, with plain-English exceptions and exact fix steps. Read-only, never writes to your books. Built for bookkeepers managing multiple Shopify + Xero clients too.