SignNow REST API

REST discovered

Details

URL: https://api.signnow.com
Docs: https://docs.signnow.com/docs/signnow/reference

Authentication

SignNow API key bearer discovered Get token ↗

Authorization: Bearer <credential>

Create a free developer account from SignNow developer signup, then open the API dashboard → Apps and Keys → select your application → API Keys and copy the API key. SignNow docs say to send it as Authorization: Bearer <API_key>.

OAuth 2.0 oauth2 discovered

Authorization: Bearer <credential>

OAuth 2.0 — self-onboarding

Point your MCP client at the server URL and approve access in the browser. The server supports OAuth Dynamic Client Registration (RFC 7591), so the client registers itself automatically — no developer-portal app, client_id, or client_secret to create.

SignNow Basic Authorization Token basic discovered Get credentials ↗

Authorization: Basic <credential>

Open the API dashboard → Apps and Keys → select your application → OAuth 2.0 and copy the Basic Authorization Token. SignNow uses this as the HTTP Authorization header with the Basic prefix, primarily to mint OAuth access tokens.