{
  "fields": [
    {"name": "invoice_number", "description": "The unique invoice identifier or number", "data_type": "string"},
    {"name": "vendor_name", "description": "Name of the company that issued the invoice", "data_type": "string"},
    {"name": "issue_date", "description": "Date the invoice was issued", "data_type": "date"},
    {"name": "due_date", "description": "Date by which payment is due", "data_type": "date"},
    {"name": "subtotal", "description": "Amount before tax", "data_type": "float"},
    {"name": "tax_amount", "description": "Total tax amount", "data_type": "float"},
    {"name": "total_amount", "description": "Final total amount due including tax", "data_type": "float"},
    {
      "name": "currency",
      "description": "Currency of the invoice amounts",
      "data_type": "enum",
      "enum_options": [
        {"name": "USD", "description": "US Dollar"},
        {"name": "EUR", "description": "Euro"},
        {"name": "GBP", "description": "British Pound"},
        {"name": "CAD", "description": "Canadian Dollar"},
        {"name": "AUD", "description": "Australian Dollar"}
      ]
    },
    {
      "name": "line_items",
      "description": "Individual line items listed on the invoice",
      "data_type": "object",
      "nested_fields": [
        {"name": "description", "description": "Description of the item or service", "data_type": "string"},
        {"name": "quantity", "description": "Number of units", "data_type": "integer"},
        {"name": "unit_price", "description": "Price per unit", "data_type": "float"},
        {"name": "amount", "description": "Total amount for this line item", "data_type": "float"}
      ]
    }
  ]
}

# Poll for results with backoff
max_attempts = 60
base_delay = 5

for attempt in range(max_attempts):
    response = requests.get(
        f"https://api.anyformat.ai/v2/files/{file_id}/extraction/",
        headers=headers
    )

    if response.status_code == 200:
        results = response.json()
        break
    elif response.status_code == 412:
        delay = min(base_delay * (1.5 ** min(attempt, 5)), 30)
        time.sleep(delay)
    else:
        raise Exception(f"Error: {response.json()['detail']}")
else:
    raise TimeoutError("Processing timed out")

# Use extracted data
print(f"Invoice #{results['invoice_number']['value']}")
print(f"Vendor: {results['vendor_name']['value']}")
print(f"Total: {results['currency']['value']} {results['total_amount']['value']}")

for item in results["line_items"]:
    print(f"  - {item['description']['value']}: {item['amount']['value']}")

{
  "invoice_number": {"value": "INV-2024-0847", "confidence": 97},
  "vendor_name": {"value": "Acme Consulting LLC", "confidence": 95},
  "issue_date": {"value": "2024-03-15", "confidence": 93},
  "due_date": {"value": "2024-04-14", "confidence": 91},
  "subtotal": {"value": 3750.00, "confidence": 94},
  "tax_amount": {"value": 337.50, "confidence": 92},
  "total_amount": {"value": 4087.50, "confidence": 96},
  "currency": {"value": "USD", "confidence": 98},
  "line_items": [
    {
      "description": {"value": "Strategy consulting - March", "confidence": 90},
      "quantity": {"value": 40, "confidence": 88},
      "unit_price": {"value": 75.00, "confidence": 91},
      "amount": {"value": 3000.00, "confidence": 93}
    },
    {
      "description": {"value": "Travel expenses", "confidence": 92},
      "quantity": {"value": 1, "confidence": 95},
      "unit_price": {"value": 750.00, "confidence": 89},
      "amount": {"value": 750.00, "confidence": 94}
    }
  ]
}