n8n + Clinch: contract workflows, self-hosted or cloud

Three recipes

• When a form is submitted, send a contract

  n8n Form Trigger (or Typeform, Tally) → HTTP Request POST /api/v1/documents with template web-design-contract and the client as signer.

• When a contract is signed, bill the first milestone

  Webhook on contract.signed → HTTP Request POST /api/v1/invoices for the first milestone, with a pay link.

• When a proposal is accepted, open the project

  Webhook on proposal.accepted → create a Linear or Jira project and a shared Google Drive folder.

Set it up

1. In Clinch, open Settings → API and create a key. In n8n, save it as a Header Auth credential: name Authorization, value Bearer <your key>.
2. To send contracts: add an HTTP Request node, POST https://clinch.lumnika.com/api/v1/documents, with that credential and a JSON body (title, template or text, signers).
3. To react to events: add a Webhook node set to POST, copy its production URL and paste it in Clinch under Settings → Integrations.
4. Optionally add a Code node that checks the X-Clinch-Signature header with your signing secret, then activate the workflow.

Example

POST https://clinch.lumnika.com/api/v1/documents
Authorization: Bearer clk_your_key
Content-Type: application/json

{
  "title": "Website redesign – Acme Bakery",
  "template": "web-design-contract",
  "signers": [{ "name": "Jane Doe", "email": "jane@acme.com" }],
  "deposit_cents": 72000
}

Questions