iterationlayer Extract Supplier Invoice Data for ERP Import
Finance agencies and outsourced AP teams use this recipe to process supplier invoices into structured data that maps directly to ERP import fields — vendor ID, GL codes, tax breakdowns, and payment terms — eliminating manual data entry.
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": "supplier-invoice-SI-8842.pdf",
"url": "https://example.com/invoices/supplier-invoice-SI-8842.pdf"
}
],
"schema": {
"fields": [
{
"name": "vendor_name",
"type": "TEXT",
"description": "Supplier or vendor company name"
},
{
"name": "vendor_tax_id",
"type": "TEXT",
"description": "Vendor VAT or tax identification number"
},
{
"name": "vendor_iban",
"type": "IBAN",
"description": "Vendor bank account IBAN"
},
{
"name": "invoice_number",
"type": "TEXT",
"description": "Supplier invoice number"
},
{
"name": "invoice_date",
"type": "DATE",
"description": "Invoice issue date"
},
{
"name": "due_date",
"type": "DATE",
"description": "Payment due date"
},
{
"name": "payment_terms",
"type": "TEXT",
"description": "Payment terms, e.g. Net 30"
},
{
"name": "currency",
"type": "CURRENCY_CODE",
"description": "Invoice currency"
},
{
"name": "line_items",
"type": "ARRAY",
"description": "Invoice line items",
"fields": [
{
"name": "description",
"type": "TEXT",
"description": "Item or service description"
},
{
"name": "gl_code",
"type": "TEXT",
"description": "General ledger account code if present"
},
{
"name": "quantity",
"type": "DECIMAL",
"description": "Quantity"
},
{
"name": "unit_price",
"type": "CURRENCY_AMOUNT",
"description": "Unit price"
},
{
"name": "line_total",
"type": "CURRENCY_AMOUNT",
"description": "Line item total"
}
]
},
{
"name": "subtotal",
"type": "CURRENCY_AMOUNT",
"description": "Subtotal before tax"
},
{
"name": "tax_amount",
"type": "CURRENCY_AMOUNT",
"description": "Total tax amount"
},
{
"name": "tax_rate",
"type": "DECIMAL",
"description": "Tax rate as a percentage"
},
{
"name": "total_amount",
"type": "CURRENCY_AMOUNT",
"description": "Total amount due"
}
]
}
}'
import { IterationLayer } from "iterationlayer";
const client = new IterationLayer({ apiKey: "YOUR_API_KEY" });
const result = await client.extractDocument({
files: [
{
type: "url",
name: "supplier-invoice-SI-8842.pdf",
url: "https://example.com/invoices/supplier-invoice-SI-8842.pdf",
},
],
schema: {
fields: [
{ name: "vendor_name", type: "TEXT", description: "Supplier or vendor company name" },
{ name: "vendor_tax_id", type: "TEXT", description: "Vendor VAT or tax identification number" },
{ name: "vendor_iban", type: "IBAN", description: "Vendor bank account IBAN" },
{ name: "invoice_number", type: "TEXT", description: "Supplier invoice number" },
{ name: "invoice_date", type: "DATE", description: "Invoice issue date" },
{ name: "due_date", type: "DATE", description: "Payment due date" },
{ name: "payment_terms", type: "TEXT", description: "Payment terms, e.g. Net 30" },
{ name: "currency", type: "CURRENCY_CODE", description: "Invoice currency" },
{
name: "line_items",
type: "ARRAY",
description: "Invoice line items",
fields: [
{ name: "description", type: "TEXT", description: "Item or service description" },
{ name: "gl_code", type: "TEXT", description: "General ledger account code if present" },
{ name: "quantity", type: "DECIMAL", description: "Quantity" },
{ name: "unit_price", type: "CURRENCY_AMOUNT", description: "Unit price" },
{ name: "line_total", type: "CURRENCY_AMOUNT", description: "Line item total" },
],
},
{ name: "subtotal", type: "CURRENCY_AMOUNT", description: "Subtotal before tax" },
{ name: "tax_amount", type: "CURRENCY_AMOUNT", description: "Total tax amount" },
{ name: "tax_rate", type: "DECIMAL", description: "Tax rate as a percentage" },
{ name: "total_amount", type: "CURRENCY_AMOUNT", description: "Total amount due" },
],
},
});
from iterationlayer import IterationLayer
client = IterationLayer(api_key="YOUR_API_KEY")
result = client.extract_document(
files=[
{
"type": "url",
"name": "supplier-invoice-SI-8842.pdf",
"url": "https://example.com/invoices/supplier-invoice-SI-8842.pdf",
}
],
schema={
"fields": [
{"name": "vendor_name", "type": "TEXT", "description": "Supplier or vendor company name"},
{"name": "vendor_tax_id", "type": "TEXT", "description": "Vendor VAT or tax identification number"},
{"name": "vendor_iban", "type": "IBAN", "description": "Vendor bank account IBAN"},
{"name": "invoice_number", "type": "TEXT", "description": "Supplier invoice number"},
{"name": "invoice_date", "type": "DATE", "description": "Invoice issue date"},
{"name": "due_date", "type": "DATE", "description": "Payment due date"},
{"name": "payment_terms", "type": "TEXT", "description": "Payment terms, e.g. Net 30"},
{"name": "currency", "type": "CURRENCY_CODE", "description": "Invoice currency"},
{
"name": "line_items",
"type": "ARRAY",
"description": "Invoice line items",
"fields": [
{"name": "description", "type": "TEXT", "description": "Item or service description"},
{"name": "gl_code", "type": "TEXT", "description": "General ledger account code if present"},
{"name": "quantity", "type": "DECIMAL", "description": "Quantity"},
{"name": "unit_price", "type": "CURRENCY_AMOUNT", "description": "Unit price"},
{"name": "line_total", "type": "CURRENCY_AMOUNT", "description": "Line item total"},
],
},
{"name": "subtotal", "type": "CURRENCY_AMOUNT", "description": "Subtotal before tax"},
{"name": "tax_amount", "type": "CURRENCY_AMOUNT", "description": "Total tax amount"},
{"name": "tax_rate", "type": "DECIMAL", "description": "Tax rate as a percentage"},
{"name": "total_amount", "type": "CURRENCY_AMOUNT", "description": "Total amount due"},
]
},
)
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: "supplier-invoice-SI-8842.pdf",
Url: "https://example.com/invoices/supplier-invoice-SI-8842.pdf",
},
},
Schema: il.ExtractionSchema{
Fields: []any{
il.TextFieldConfig{
Name: "vendor_name",
Type: "TEXT",
Description: "Supplier or vendor company name",
},
il.TextFieldConfig{
Name: "vendor_tax_id",
Type: "TEXT",
Description: "Vendor VAT or tax identification number",
},
il.IbanFieldConfig{
Name: "vendor_iban",
Type: "IBAN",
Description: "Vendor bank account IBAN",
},
il.TextFieldConfig{
Name: "invoice_number",
Type: "TEXT",
Description: "Supplier invoice number",
},
il.DateFieldConfig{
Name: "invoice_date",
Type: "DATE",
Description: "Invoice issue date",
},
il.DateFieldConfig{
Name: "due_date",
Type: "DATE",
Description: "Payment due date",
},
il.TextFieldConfig{
Name: "payment_terms",
Type: "TEXT",
Description: "Payment terms, e.g. Net 30",
},
il.CurrencyCodeFieldConfig{
Name: "currency",
Type: "CURRENCY_CODE",
Description: "Invoice currency",
},
il.ArrayFieldConfig{
Name: "line_items",
Type: "ARRAY",
Description: "Invoice line items",
Fields: []any{
il.TextFieldConfig{
Name: "description",
Type: "TEXT",
Description: "Item or service description",
},
il.TextFieldConfig{
Name: "gl_code",
Type: "TEXT",
Description: "General ledger account code if present",
},
il.DecimalFieldConfig{
Name: "quantity",
Type: "DECIMAL",
Description: "Quantity",
},
il.CurrencyAmountFieldConfig{
Name: "unit_price",
Type: "CURRENCY_AMOUNT",
Description: "Unit price",
},
il.CurrencyAmountFieldConfig{
Name: "line_total",
Type: "CURRENCY_AMOUNT",
Description: "Line item total",
},
},
},
il.CurrencyAmountFieldConfig{
Name: "subtotal",
Type: "CURRENCY_AMOUNT",
Description: "Subtotal before tax",
},
il.CurrencyAmountFieldConfig{
Name: "tax_amount",
Type: "CURRENCY_AMOUNT",
Description: "Total tax amount",
},
il.DecimalFieldConfig{
Name: "tax_rate",
Type: "DECIMAL",
Description: "Tax rate as a percentage",
},
il.CurrencyAmountFieldConfig{
Name: "total_amount",
Type: "CURRENCY_AMOUNT",
Description: "Total amount due",
},
},
},
})
if err != nil {
panic(err)
}
_ = result
}
{
"name": "Extract supplier invoice data for ERP import in Iteration Layer",
"nodes": [
{
"parameters": {
"content": "## Extract Supplier Invoice Data for ERP Import\n\nFinance agencies and outsourced AP teams use this recipe to process supplier invoices into structured data that maps directly to ERP import fields — vendor ID, GL codes, tax breakdowns, and payment terms — eliminating manual data entry.\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": "a7b8c9d0-e1f2-3456-abcd-456789012301",
"name": "Overview"
},
{
"parameters": {
"content": "### Step 1: Extract Invoice 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": "a7b8c9d0-e1f2-3456-abcd-456789012302",
"name": "Step 1 Note"
},
{
"parameters": {},
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
250,
300
],
"id": "a7b8c9d0-e1f2-3456-abcd-456789012303",
"name": "Manual Trigger"
},
{
"parameters": {
"resource": "documentExtraction",
"schemaInputMode": "rawJson",
"schemaJson": "{\"fields\":[{\"name\":\"vendor_name\",\"type\":\"TEXT\",\"description\":\"Supplier or vendor company name\"},{\"name\":\"vendor_tax_id\",\"type\":\"TEXT\",\"description\":\"Vendor VAT or tax identification number\"},{\"name\":\"vendor_iban\",\"type\":\"IBAN\",\"description\":\"Vendor bank account IBAN\"},{\"name\":\"invoice_number\",\"type\":\"TEXT\",\"description\":\"Supplier invoice number\"},{\"name\":\"invoice_date\",\"type\":\"DATE\",\"description\":\"Invoice issue date\"},{\"name\":\"due_date\",\"type\":\"DATE\",\"description\":\"Payment due date\"},{\"name\":\"payment_terms\",\"type\":\"TEXT\",\"description\":\"Payment terms\"},{\"name\":\"currency\",\"type\":\"CURRENCY_CODE\",\"description\":\"Invoice currency\"},{\"name\":\"line_items\",\"type\":\"ARRAY\",\"description\":\"Invoice line items\",\"fields\":[{\"name\":\"description\",\"type\":\"TEXT\",\"description\":\"Item or service description\"},{\"name\":\"gl_code\",\"type\":\"TEXT\",\"description\":\"General ledger account code\"},{\"name\":\"quantity\",\"type\":\"DECIMAL\",\"description\":\"Quantity\"},{\"name\":\"unit_price\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Unit price\"},{\"name\":\"line_total\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Line item total\"}]},{\"name\":\"subtotal\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Subtotal before tax\"},{\"name\":\"tax_amount\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Total tax amount\"},{\"name\":\"tax_rate\",\"type\":\"DECIMAL\",\"description\":\"Tax rate as a percentage\"},{\"name\":\"total_amount\",\"type\":\"CURRENCY_AMOUNT\",\"description\":\"Total amount due\"}]}",
"files": {
"fileValues": [
{
"fileInputMode": "url",
"fileName": "supplier-invoice-SI-8842.pdf",
"fileUrl": "https://example.com/invoices/supplier-invoice-SI-8842.pdf"
}
]
}
},
"type": "n8n-nodes-iterationlayer.iterationLayer",
"typeVersion": 1,
"position": [
500,
300
],
"id": "a7b8c9d0-e1f2-3456-abcd-456789012304",
"name": "Extract Invoice Data",
"credentials": {
"iterationLayerApi": {
"id": "1",
"name": "Iteration Layer API"
}
}
}
],
"connections": {
"Manual Trigger": {
"main": [
[
{
"node": "Extract Invoice Data",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1"
}
}
Extract supplier invoice data for ERP import from the file at [file URL]. Use the extract_document tool with these fields:
- vendor_name (TEXT): Supplier or vendor company name
- vendor_tax_id (TEXT): Vendor VAT or tax identification number
- vendor_iban (IBAN): Vendor bank account IBAN
- invoice_number (TEXT): Supplier invoice number
- invoice_date (DATE): Invoice issue date
- due_date (DATE): Payment due date
- payment_terms (TEXT): Payment terms, e.g. Net 30
- currency (CURRENCY_CODE): Invoice currency
- line_items (ARRAY): Each with description (TEXT), gl_code (TEXT), quantity (DECIMAL), unit_price (CURRENCY_AMOUNT), line_total (CURRENCY_AMOUNT)
- subtotal (CURRENCY_AMOUNT): Subtotal before tax
- tax_amount (CURRENCY_AMOUNT): Total tax amount
- tax_rate (DECIMAL): Tax rate as a percentage
- total_amount (CURRENCY_AMOUNT): Total amount due
Response
{
"success": true,
"data": {
"vendor_name": {
"value": "Brenner Industrial Supply GmbH",
"confidence": 0.98,
"citations": [
"Brenner Industrial Supply GmbH"
]
},
"vendor_tax_id": {
"value": "DE298374561",
"confidence": 0.97,
"citations": [
"USt-IdNr.: DE298374561"
]
},
"vendor_iban": {
"value": "DE89370400440532013000",
"confidence": 0.96,
"citations": [
"IBAN: DE89 3704 0044 0532 0130 00"
]
},
"invoice_number": {
"value": "SI-8842",
"confidence": 0.99,
"citations": [
"Rechnung Nr. SI-8842"
]
},
"invoice_date": {
"value": "2026-03-20",
"confidence": 0.98,
"citations": [
"Datum: 20.03.2026"
]
},
"due_date": {
"value": "2026-04-19",
"confidence": 0.97,
"citations": [
"Zahlungsziel: 19.04.2026"
]
},
"payment_terms": {
"value": "Net 30",
"confidence": 0.95,
"citations": [
"Zahlungsbedingungen: 30 Tage netto"
]
},
"currency": {
"value": "EUR",
"confidence": 0.99,
"citations": [
"EUR"
]
},
"line_items": {
"value": [
{
"description": {
"value": "Hydraulic press maintenance kit",
"confidence": 0.96,
"citations": [
"Hydraulic press maintenance kit"
]
},
"gl_code": {
"value": "6200",
"confidence": 0.88,
"citations": [
"Konto 6200"
]
},
"quantity": {
"value": 2.0,
"confidence": 0.98,
"citations": [
"Menge: 2"
]
},
"unit_price": {
"value": {
"amount": "340.00",
"currency": "EUR"
},
"confidence": 0.97,
"citations": [
"340,00 EUR"
]
},
"line_total": {
"value": {
"amount": "680.00",
"currency": "EUR"
},
"confidence": 0.97,
"citations": [
"680,00 EUR"
]
}
}
],
"confidence": 0.96,
"citations": []
},
"subtotal": {
"value": {
"amount": "680.00",
"currency": "EUR"
},
"confidence": 0.97,
"citations": [
"Nettobetrag: 680,00 EUR"
]
},
"tax_amount": {
"value": {
"amount": "129.20",
"currency": "EUR"
},
"confidence": 0.97,
"citations": [
"MwSt. 19%: 129,20 EUR"
]
},
"tax_rate": {
"value": 19.0,
"confidence": 0.98,
"citations": [
"19%"
]
},
"total_amount": {
"value": {
"amount": "809.20",
"currency": "EUR"
},
"confidence": 0.98,
"citations": [
"Gesamtbetrag: 809,20 EUR"
]
}
}
}