Automating Invoice Processing with GPT-5.2 and DocsRouter

Invoice Automation with GPT-5.2

Manual data entry is the silent killer of productivity. Processing a single invoice costs the average business $12 to $15 in labor.

With GPT-5.2 accessed through DocsRouter, you can drive that cost down to $0.01. Here is how to build an automated pipeline.

The Challenge: Variance

Invoices come in thousands of layouts. A rule-based system that works for "Amazon Web Services" will fail for "Joe's Plumbing."

GPT-5.2 solves this through semantic understanding. It doesn't look for keywords; it looks for meaning. It knows that "Amount Due" and "Total to Pay" mean the same thing.

The Schema

To automate AP (Accounts Payable), you need more than text; you need a database record. Here is the Zod schema we will use with DocsRouter:

const AP_Schema = {
  type: "object",
  properties: {
    invoice_number: { type: "string" },
    issue_date: { type: "string", format: "YYYY-MM-DD" },
    due_date: { type: "string", format: "YYYY-MM-DD" },
    vendor: {
      type: "object",
      properties: {
        name: { type: "string" },
        address: { type: "string" },
        tax_id: { type: "string" }
      }
    },
    line_items: {
      type: "array",
      items: {
        type: "object",
        properties: {
          description: { type: "string" },
          quantity: { type: "number" },
          unit_price: { type: "number" },
          total: { type: "number" }
        }
      }
    },
    subtotal: { type: "number" },
    tax_amount: { type: "number" },
    total_amount: { type: "number" },
    currency: { type: "string" }
  },
  required: ["invoice_number", "date", "total_amount", "vendor"]
};

Handling Approvals

DocsRouter returns a confidence score with every extract.

Confidence > 90%: Auto-approve and sync to Xero/Quickbooks.
Confidence < 90%: Flag for human review.

This "human-in-the-loop" strategy allows you to automate the easy 80% immediately and gradually improve as models get smarter.

Start Building

Stop wasting time on data entry. Sign up for DocsRouter and deploy your invoice bot today.