4 APIs to Build an Export-Ready Invoice Generation Workflow in Xero

The average invoicing softwares are designed for domestic billing. While they handle tax, formatting, and payment terms well; they lack support for cross border trade functions like custom compliance: no HS code lookup, no destination country logic, no audit trail for where the code came from. You end up doing these part manually every time. Here's how to automate it. The workflow Pull product and order data from Xero → classify each product line with HS Ping → write the HS codes back into the Xero invoice. API #1 — Xero (your system of record) Xero is where your order and product data lives. You're pulling two things: the line items on a draft invoice (product description, quantity, unit price) the buyer's details. GET https://api.xero.com/api.xro/2.0/Invoices/{InvoiceID} The response gives you the full invoice object including LineItems, each with a Description field. That description is what you'll feed into HS Ping. Tips: You'll need OAuth 2.0 with the accounting.transactions scope