Building a Shopify to Xero Invoice Sync in Python (With Code)

You've got a Shopify store. You've got Xero for accounting. And you're tired of paying £30/month for a connector app that occasionally breaks and gives you zero control over how invoices are mapped. So let's build our own sync — in Python. I'll walk you through every piece: OAuth token management, fetching Shopify orders, mapping them to Xero invoices, handling VAT correctly, rate limiting, and state tracking so you never create duplicates. This is production code. We've been running this at Beauty Hair Products for months without issues. Related: If you want the higher-level business case first, check out Connect Shopify to Xero Without Paying for a Connector on our blog. Architecture Overview The flow is straightforward: Fetch paid orders from Shopify's Admin API Check state — skip orders we've already synced Check Xero — skip invoices that already exist (belt and braces) Map order → invoice — line items, VAT, shipping, discounts POST to Xero — create the invoice Update state — recor