iterationlayer Extract Invoice Data
Accounts payable teams and finance automation platforms use this recipe to use the Iteration Layer Document Extraction API as an invoice extraction API for PDF and scanned invoices. 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 during the 7-day trial.
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.extractDocument({
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_document(
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.ExtractDocument(il.ExtractDocumentRequest{
Files: []il.FileInput{
il.FileInput{
Type: "url",
Name: "invoice.pdf",
Url: "https://example.com/invoices/2026-001.pdf",
},
},
Schema: il.ExtractionSchema{
Fields: []any{
il.TextFieldConfig{
Name: "vendor",
Type: "TEXT",
Description: "Vendor or supplier name",
},
il.TextFieldConfig{
Name: "invoice_number",
Type: "TEXT",
Description: "Invoice reference number",
},
il.DateFieldConfig{
Name: "date",
Type: "DATE",
Description: "Invoice date",
},
il.ArrayFieldConfig{
Name: "line_items",
Type: "ARRAY",
Description: "Individual line items",
Fields: []any{
il.TextFieldConfig{
Name: "description",
Type: "TEXT",
Description: "Item description",
},
il.IntegerFieldConfig{
Name: "quantity",
Type: "INTEGER",
Description: "Quantity ordered",
},
il.CurrencyAmountFieldConfig{
Name: "unit_price",
Type: "CURRENCY_AMOUNT",
Description: "Price per unit",
},
},
},
il.CurrencyAmountFieldConfig{
Name: "total_amount",
Type: "CURRENCY_AMOUNT",
Description: "Total invoice amount",
},
},
},
})
if err != nil {
panic(err)
}
_ = result
}
{
"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 on self-hosted n8n, or add it directly on n8n Cloud with Verified Community Nodes enabled.",
"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": "Alpine Office Supplies GmbH",
"confidence": 0.97,
"citations": ["Alpine Office Supplies GmbH"]
},
"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": "EUR"
},
"confidence": 0.97,
"citations": ["EUR 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": "EUR"
},
"confidence": 0.96,
"citations": ["EUR 189.00 each"]
}
}
],
"confidence": 0.96,
"citations": []
},
"total_amount": {
"value": {
"amount": "888.98",
"currency": "EUR"
},
"confidence": 0.98,
"citations": ["Total Due: EUR 888.98"]
}
}
}