Skills extract-invoice-data

Name: extract-invoice-data
Author: iterationlayer

Extract vendor name, line items, totals, and dates from invoice documents.

install

source · Clone the upstream repo

git clone https://github.com/iterationlayer/skills

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/iterationlayer/skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/extract-invoice-data" ~/.claude/skills/iterationlayer-skills-extract-invoice-data && rm -rf "$T"

manifest: skills/extract-invoice-data/SKILL.md

source content

Extract Invoice Data

Accounts payable teams and finance automation platforms use this recipe to eliminate manual invoice data entry. Upload an invoice in any supported format and receive structured JSON with vendor details, line items, and totals — ready to feed into your ERP or accounting system.

APIs Used

Document Extraction (1 credit per page)

Prerequisites

You need an Iteration Layer API key. Get one at platform.iterationlayer.com — free trial credits included, no credit card required.

For full integration guidance (SDKs, auth, MCP, error handling), see the Iteration Layer Integration Guide.

Implementation

curl -X POST https://api.iterationlayer.com/document-extraction/v1/extract \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "files": [
      {
        "type": "url",
        "name": "invoice.pdf",
        "url": "https://example.com/invoices/2026-001.pdf"
      }
    ],
    "schema": {
      "fields": [
        {
          "name": "vendor",
          "type": "TEXT",
          "description": "Vendor or supplier name"
        },
        {
          "name": "invoice_number",
          "type": "TEXT",
          "description": "Invoice reference number"
        },
        {
          "name": "date",
          "type": "DATE",
          "description": "Invoice date"
        },
        {
          "name": "line_items",
          "type": "ARRAY",
          "description": "Individual line items",
          "fields": [
            {
              "name": "description",
              "type": "TEXT",
              "description": "Item description"
            },
            {
              "name": "quantity",
              "type": "INTEGER",
              "description": "Quantity ordered"
            },
            {
              "name": "unit_price",
              "type": "CURRENCY_AMOUNT",
              "description": "Price per unit"
            }
          ]
        },
        {
          "name": "total_amount",
          "type": "CURRENCY_AMOUNT",
          "description": "Total invoice amount"
        }
      ]
    }
  }'

import { IterationLayer } from "iterationlayer";
const client = new IterationLayer({ apiKey: "YOUR_API_KEY" });

const result = await client.extract({
  files: [
    {
      type: "url",
      name: "invoice.pdf",
      url: "https://example.com/invoices/2026-001.pdf",
    },
  ],
  schema: {
    fields: [
      {
        name: "vendor",
        type: "TEXT",
        description: "Vendor or supplier name",
      },
      {
        name: "invoice_number",
        type: "TEXT",
        description: "Invoice reference number",
      },
      {
        name: "date",
        type: "DATE",
        description: "Invoice date",
      },
      {
        name: "line_items",
        type: "ARRAY",
        description: "Individual line items",
        fields: [
          {
            name: "description",
            type: "TEXT",
            description: "Item description",
          },
          {
            name: "quantity",
            type: "INTEGER",
            description: "Quantity ordered",
          },
          {
            name: "unit_price",
            type: "CURRENCY_AMOUNT",
            description: "Price per unit",
          },
        ],
      },
      {
        name: "total_amount",
        type: "CURRENCY_AMOUNT",
        description: "Total invoice amount",
      },
    ],
  },
});

from iterationlayer import IterationLayer
client = IterationLayer(api_key="YOUR_API_KEY")

result = client.extract(
    files=[
        {
            "type": "url",
            "name": "invoice.pdf",
            "url": "https://example.com/invoices/2026-001.pdf",
        }
    ],
    schema={
        "fields": [
            {
                "name": "vendor",
                "type": "TEXT",
                "description": "Vendor or supplier name",
            },
            {
                "name": "invoice_number",
                "type": "TEXT",
                "description": "Invoice reference number",
            },
            {
                "name": "date",
                "type": "DATE",
                "description": "Invoice date",
            },
            {
                "name": "line_items",
                "type": "ARRAY",
                "description": "Individual line items",
                "fields": [
                    {
                        "name": "description",
                        "type": "TEXT",
                        "description": "Item description",
                    },
                    {
                        "name": "quantity",
                        "type": "INTEGER",
                        "description": "Quantity ordered",
                    },
                    {
                        "name": "unit_price",
                        "type": "CURRENCY_AMOUNT",
                        "description": "Price per unit",
                    },
                ],
            },
            {
                "name": "total_amount",
                "type": "CURRENCY_AMOUNT",
                "description": "Total invoice amount",
            },
        ]
    },
)

package main

import il "github.com/iterationlayer/sdk-go"

func main() {
	client := il.NewClient("YOUR_API_KEY")

	result, err := client.Extract(il.ExtractRequest{
		Files: []il.FileInput{
			il.NewFileFromURL(
				"invoice.pdf",
				"https://example.com/invoices/2026-001.pdf",
			),
		},
		Schema: il.ExtractionSchema{
			"vendor": il.NewTextFieldConfig(
				"vendor",
				"Vendor or supplier name",
			),
			"invoice_number": il.NewTextFieldConfig(
				"invoice_number",
				"Invoice reference number",
			),
			"date": il.NewDateFieldConfig(
				"date",
				"Invoice date",
			),
			"line_items": il.NewArrayFieldConfig(
				"line_items",
				"Individual line items",
				[]il.FieldConfig{
					il.NewTextFieldConfig(
						"description",
						"Item description",
					),
					il.NewIntegerFieldConfig(
						"quantity",
						"Quantity ordered",
					),
					il.NewCurrencyAmountFieldConfig(
						"unit_price",
						"Price per unit",
					),
				},
			),
			"total_amount": il.NewCurrencyAmountFieldConfig(
				"total_amount",
				"Total invoice amount",
			),
		},
	})
	if err != nil {
		panic(err)
	}
}

{
  "name": "Extract Invoice Data",
  "nodes": [
    {
      "parameters": {
        "content": "## Extract Invoice Data\n\nAccounts payable teams and finance automation platforms use this recipe to eliminate manual invoice data entry. Upload an invoice in any supported format and receive structured JSON with vendor details, line items, and totals \u2014 ready to feed into your ERP or accounting system.\n\n**Note:** This workflow uses the Iteration Layer community node (`n8n-nodes-iterationlayer`). Install it via Settings > Community Nodes before importing. Self-hosted n8n only.",
        "height": 280,
        "width": 500,
        "color": 2
      },
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        200,
        40
      ],
      "id": "740bbc39-f879-4a4d-b1a7-4b66dfac8f09",
      "name": "Overview"
    },
    {
      "parameters": {
        "content": "### Step 1: Extract Data\nResource: **Document Extraction**\n\nConfigure the Document Extraction parameters below, then connect your credentials.",
        "height": 160,
        "width": 300,
        "color": 6
      },
      "type": "n8n-nodes-base.stickyNote",
      "typeVersion": 1,
      "position": [
        475,
        100
      ],
      "id": "0ad47fa7-0338-4060-bc1b-f5c1aa248b53",
      "name": "Step 1 Note"
    },
    {
      "parameters": {},
      "type": "n8n-nodes-base.manualTrigger",
      "typeVersion": 1,
      "position": [
        250,
        300
      ],
      "id": "c9d0e1f2-a3b4-5678-cdef-789012345678",
      "name": "Manual Trigger"
    },
    {
      "parameters": {
        "resource": "documentExtraction",
        "schemaInputMode": "rawJson",
        "schemaJson": "{\"fields\":[{\"name\":\"vendor\",\"type\":\"TEXT\",\"description\":\"Vendor or supplier name\"},{\"name\":\"invoice_number\",\"type\":\"TEXT\",\"description\":\"Invoice reference number\"},{\"name\":\"date\",\"type\":\"DATE\",\"description\":\"Invoice date\"},{\"name\":\"line_items\",\"type\":\"ARRAY\",\"description\":\"Individual line items\",\"fields\":[{\"name\":\"description\",\"type\":\"TEXT\",\"description\":\"Item description\"},{\"name\":\"quantity\",\"type\":\"INTEGER\",\"description\":\"Quantity ordered\"},{\"name\":\"unit_price\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Price per unit\"}]},{\"name\":\"total_amount\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Total invoice amount\"}]}",
        "files": {
          "fileValues": [
            {
              "fileInputMode": "url",
              "fileName": "invoice.pdf",
              "fileUrl": "https://example.com/invoices/2026-001.pdf"
            }
          ]
        }
      },
      "type": "n8n-nodes-iterationlayer.iterationLayer",
      "typeVersion": 1,
      "position": [
        500,
        300
      ],
      "id": "d0e1f2a3-b4c5-6789-defa-890123456789",
      "name": "Extract Data",
      "credentials": {
        "iterationLayerApi": {
          "id": "1",
          "name": "Iteration Layer API"
        }
      }
    }
  ],
  "connections": {
    "Manual Trigger": {
      "main": [
        [
          {
            "node": "Extract Data",
            "type": "main",
            "index": 0
          }
        ]
      ]
    }
  },
  "settings": {
    "executionOrder": "v1"
  }
}

Extract invoice data from the file at [file URL]. Use the extract_document tool with these fields:

- vendor (TEXT): Vendor or supplier name
- invoice_number (TEXT): Invoice reference number
- date (DATE): Invoice date
- line_items (ARRAY): Each with description (TEXT), quantity (INTEGER), unit_price (CURRENCY_AMOUNT)
- total_amount (CURRENCY_AMOUNT): Total invoice amount

Response

{
  "success": true,
  "data": {
    "vendor": {
      "value": "Acme Office Supplies Ltd.",
      "confidence": 0.97,
      "citations": ["Acme Office Supplies Ltd."]
    },
    "invoice_number": {
      "value": "INV-2026-001",
      "confidence": 0.99,
      "citations": ["Invoice #INV-2026-001"]
    },
    "date": {
      "value": "2026-01-15",
      "confidence": 0.98,
      "citations": ["Date: January 15, 2026"]
    },
    "line_items": {
      "value": [
        {
          "description": {
            "value": "Ergonomic Desk Chair",
            "confidence": 0.96,
            "citations": ["Ergonomic Desk Chair"]
          },
          "quantity": {
            "value": 2,
            "confidence": 0.98,
            "citations": ["Qty: 2"]
          },
          "unit_price": {
            "value": {
              "amount": "349.99",
              "currency": "USD"
            },
            "confidence": 0.97,
            "citations": ["$349.99 each"]
          }
        },
        {
          "description": {
            "value": "Standing Desk Converter",
            "confidence": 0.95,
            "citations": ["Standing Desk Converter"]
          },
          "quantity": {
            "value": 1,
            "confidence": 0.99,
            "citations": ["Qty: 1"]
          },
          "unit_price": {
            "value": {
              "amount": "189.00",
              "currency": "USD"
            },
            "confidence": 0.96,
            "citations": ["$189.00 each"]
          }
        }
      ],
      "confidence": 0.96,
      "citations": []
    },
    "total_amount": {
      "value": {
        "amount": "888.98",
        "currency": "USD"
      },
      "confidence": 0.98,
      "citations": ["Total Due: $888.98"]
    }
  }
}