Integrations

Connect thelawin.dev with your existing tools to generate e-invoices. Every integration works the same way: one POST request to /v1/generate, and you get a valid ZUGFeRD or XRechnung PDF back.

Automation Platforms

Platform	Use Case	Guide
n8n	Self-hosted workflow automation	n8n Guide
Zapier	No-code automation	Zapier Guide
Make.com	Visual workflow builder	Make Guide
AI Agents	Claude Code, MCP, LLM-driven invoicing	AI Agents Guide

E-Commerce

Platform	Use Case	Guide
Stripe	Payment webhook → automatic invoice	Stripe Guide
Shopify	Order → ZUGFeRD invoice	Shopify Guide
WooCommerce	Order → e-invoice PDF	WooCommerce Guide

Accounting

Software	Use Case	Guide
DATEV	ZUGFeRD invoices for DATEV import	DATEV Guide
lexoffice	Cloud accounting + thelawin	lexoffice Guide
sevDesk	Automate e-invoicing	sevDesk Guide

Quick Start

The pattern is always the same:

1. Something triggers the flow (webhook, schedule, button click)
2. You build the invoice JSON
3. POST it to api.thelawin.dev/v1/generate with your API key
4. Do something with the PDF (save it, email it, upload it)

curl -X POST https://api.thelawin.dev/v1/generate \
  -H "Content-Type: application/json" \
  -H "X-API-Key: env_sandbox_demo" \
  -d '{"invoice":{"number":"001","date":"2026-01-15","seller":{"name":"Acme GmbH"},"buyer":{"name":"Customer AG"},"items":[{"description":"Service","quantity":1,"unit_price":100}]}}'

Demo Key

Use env_sandbox_demo to test any integration right away. No account needed. PDFs get a SANDBOX watermark.

API Key

For production use, sign up and create an API key in the dashboard. See Authentication for details.