SignNow

Access the SignNow API with managed OAuth authentication. Upload documents, send signature invites, manage templates, and automate e-signature workflows.

Quick Start

# Get current user info
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/signnow/user')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://api.maton.ai/signnow/{resource}

Maton proxies requests to api.signnow.com and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as MATON_API_KEY:

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

1. Sign in or create an account at maton.ai
2. Go to maton.ai/settings
3. Copy your API key

Connection Management

Manage your SignNow OAuth connections at https://api.maton.ai.

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections?app=signnow&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'signnow'}).encode()
req = urllib.request.Request('https://api.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "{connection_id}",
    "status": "ACTIVE",
    "creation_time": "2026-02-08T20:47:23.019763Z",
    "last_updated_time": "2026-02-08T20:50:32.210896Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "signnow",
    "metadata": {}
  }
}

Open the returned url in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple SignNow connections, specify which one to use with the Maton-Connection header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/signnow/user')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '{connection_id}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If you have multiple connections, always include this header to ensure requests go to the intended account.

Security & Permissions

• Access is scoped to documents, templates, signing invites, and folders within the connected SignNow account.
• All write operations require explicit user approval. Before executing any create, update, or delete call, confirm the target resource and intended effect with the user.

API Reference

User Operations

Get Current User

GET /signnow/user

Response:

{
  "id": "59cce130e93a4e9488522ca67e3a6779f3e48a72",
  "first_name": "Chris",
  "last_name": "Kim",
  "active": "1",
  "verified": true,
  "emails": ["chris@example.com"],
  "primary_email": "chris@example.com",
  "document_count": 0,
  "subscriptions": [...],
  "teams": [...],
  "organization": {...}
}

Get User Documents

GET /signnow/user/documents

Response:

[
  {
    "id": "c63a7bc73f03449c987bf0feaa36e96212408352",
    "document_name": "Contract",
    "page_count": "3",
    "created": "1770598603",
    "updated": "1770598603",
    "original_filename": "contract.pdf",
    "owner": "chris@example.com",
    "template": false,
    "roles": [],
    "field_invites": [],
    "signatures": []
  }
]

Document Operations

Upload Document

Documents must be uploaded as multipart form data with a PDF file:

python <<'EOF'
import urllib.request, os, json

def encode_multipart_formdata(files):
    boundary = '----WebKitFormBoundary7MA4YWxkTrZu0gW'
    lines = []
    for (key, filename, content) in files:
        lines.append(f'--{boundary}'.encode())
        lines.append(f'Content-Disposition: form-data; name="{key}"; filename="{filename}"'.encode())
        lines.append(b'Content-Type: application/pdf')
        lines.append(b'')
        lines.append(content)
    lines.append(f'--{boundary}--'.encode())
    lines.append(b'')
    body = b'\r\n'.join(lines)
    content_type = f'multipart/form-data; boundary={boundary}'
    return content_type, body

with open('document.pdf', 'rb') as f:
    file_content = f.read()

content_type, body = encode_multipart_formdata([('file', 'document.pdf', file_content)])
req = urllib.request.Request('https://api.maton.ai/signnow/document', data=body, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', content_type)
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "id": "c63a7bc73f03449c987bf0feaa36e96212408352"
}

Get Document

GET /signnow/document/{document_id}

Response:

{
  "id": "c63a7bc73f03449c987bf0feaa36e96212408352",
  "document_name": "Contract",
  "page_count": "3",
  "created": "1770598603",
  "updated": "1770598603",
  "original_filename": "contract.pdf",
  "owner": "chris@example.com",
  "template": false,
  "roles": [],
  "viewer_roles": [],
  "attachments": [],
  "fields": [],
  "signatures": [],
  "texts": [],
  "checks": []
}

Update Document

PUT /signnow/document/{document_id}
Content-Type: application/json

{
  "document_name": "Updated Contract Name"
}

Response:

{
  "id": "c63a7bc73f03449c987bf0feaa36e96212408352",
  "signatures": [],
  "texts": [],
  "checks": []
}

Download Document

GET /signnow/document/{document_id}/download?type=collapsed

Returns the PDF file as binary data.

Query parameters:

• type - Download type: collapsed (flattened PDF), zip (all pages as images)

Get Document History

GET /signnow/document/{document_id}/historyfull

Response:

[
  {
    "unique_id": "c4eb89d84b2b407ba8ec1cf4d25b8b435bcef69d",
    "user_id": "59cce130e93a4e9488522ca67e3a6779f3e48a72",
    "document_id": "c63a7bc73f03449c987bf0feaa36e96212408352",
    "email": "chris@example.com",
    "created": 1770598603,
    "event": "created_document"
  }
]

Move Document to Folder

POST /signnow/document/{document_id}/move
Content-Type: application/json

{
  "folder_id": "5e2798bdd3d642c3aefebe333bb5b723d6db01a4"
}

Response:

{
  "result": "success"
}

Merge Documents

Combines multiple documents into a single PDF:

POST /signnow/document/merge
Content-Type: application/json

{
  "name": "Merged Document",
  "document_ids": ["doc_id_1", "doc_id_2"]
}

Returns the merged PDF as binary data.

Delete Document

DELETE /signnow/document/{document_id}

Response:

{
  "status": "success"
}

Template Operations

Create Template from Document

POST /signnow/template
Content-Type: application/json

{
  "document_id": "c63a7bc73f03449c987bf0feaa36e96212408352",
  "document_name": "Contract Template"
}

Response:

{
  "id": "47941baee4f74784bc1d37c25e88836fc38ed501"
}

Create Document from Template

POST /signnow/template/{template_id}/copy
Content-Type: application/json

{
  "document_name": "New Contract from Template"
}

Response:

{
  "id": "08f5f4a2cc1a4d6c8a986adbf90be2308807d4ae",
  "name": "New Contract from Template"
}

Signature Invite Operations

Send Freeform Invite

Send a document for signature:

POST /signnow/document/{document_id}/invite
Content-Type: application/json

{
  "to": "signer@example.com",
  "from": "sender@example.com"
}

Response:

{
  "result": "success",
  "id": "c38a57f08f2e48d98b5de52f75f7b1dd0a074c00",
  "callback_url": "none"
}

Note: Custom subject and message require a paid subscription plan.

Create Signing Link

Create an embeddable signing link (requires document fields):

POST /signnow/link
Content-Type: application/json

{
  "document_id": "c63a7bc73f03449c987bf0feaa36e96212408352"
}

Note: Document must have signature fields added before creating a signing link.

Folder Operations

Get All Folders

GET /signnow/folder

Response:

{
  "id": "2ea71a3a9d06470d8e5ec0df6122971f47db7706",
  "name": "Root",
  "system_folder": true,
  "folders": [
    {
      "id": "5e2798bdd3d642c3aefebe333bb5b723d6db01a4",
      "name": "Documents",
      "document_count": "5",
      "template_count": "2"
    },
    {
      "id": "fafdef6de6d947fc84627e4ddeed6987bfeee02d",
      "name": "Templates",
      "document_count": "0",
      "template_count": "3"
    },
    {
      "id": "6063688b1e724a25aa98befcc3f2cb7795be7da1",
      "name": "Trash Bin",
      "document_count": "0"
    }
  ],
  "total_documents": 0,
  "documents": []
}

Get Folder by ID

GET /signnow/folder/{folder_id}

Response:

{
  "id": "5e2798bdd3d642c3aefebe333bb5b723d6db01a4",
  "name": "Documents",
  "user_id": "59cce130e93a4e9488522ca67e3a6779f3e48a72",
  "parent_id": "2ea71a3a9d06470d8e5ec0df6122971f47db7706",
  "system_folder": true,
  "folders": [],
  "total_documents": 5,
  "documents": [...]
}

Webhook (Event Subscription) Operations

List Event Subscriptions

GET /signnow/event_subscription

Response:

{
  "subscriptions": [
    {
      "id": "b1d6700dfb0444ed9196e913b2515ae8d5f731a7",
      "event": "document.complete",
      "created": "1770598678",
      "callback_url": "https://example.com/webhook"
    }
  ]
}

Create Event Subscription

POST /signnow/event_subscription
Content-Type: application/json

{
  "event": "document.complete",
  "callback_url": "https://example.com/webhook"
}

Response:

{
  "id": "b1d6700dfb0444ed9196e913b2515ae8d5f731a7",
  "created": 1770598678
}

Available Events:

• document.create - Document created
• document.update - Document updated
• document.delete - Document deleted
• document.complete - Document signed by all parties
• invite.create - Invite sent
• invite.update - Invite updated

Delete Event Subscription

DELETE /signnow/event_subscription/{subscription_id}

Response:

{
  "id": "b1d6700dfb0444ed9196e913b2515ae8d5f731a7",
  "status": "deleted"
}

Code Examples

JavaScript

const response = await fetch(
  'https://api.maton.ai/signnow/user',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests

response = requests.get(
    'https://api.maton.ai/signnow/user',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

Python (Upload Document)

import os
import requests

with open('document.pdf', 'rb') as f:
    response = requests.post(
        'https://api.maton.ai/signnow/document',
        headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
        files={'file': ('document.pdf', f, 'application/pdf')}
    )
doc = response.json()
print(f"Uploaded document: {doc['id']}")

Python (Send Invite)

import os
import requests

doc_id = "c63a7bc73f03449c987bf0feaa36e96212408352"
response = requests.post(
    f'https://api.maton.ai/signnow/document/{doc_id}/invite',
    headers={
        'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}',
        'Content-Type': 'application/json'
    },
    json={
        'to': 'signer@example.com',
        'from': 'sender@example.com'
    }
)
result = response.json()
print(f"Invite sent: {result['id']}")

Notes

• Documents must be in PDF format for upload
• Supported file types: PDF, DOC, DOCX, ODT, RTF, PNG, JPG
• System folders (Documents, Templates, Archive, Trash Bin) cannot be renamed or deleted
• Creating signing links requires documents to have signature fields
• Custom invite subject/message requires a paid subscription
• Rate limit in development mode: 500 requests/hour per application
• IMPORTANT: When piping curl output to jq or other commands, environment variables like $MATON_API_KEY may not expand correctly in some shell environments

Error Handling

SignNow errors include detailed messages:

{
  "errors": [
    {
      "code": 65578,
      "message": "Invalid file type."
    }
  ]
}

Troubleshooting: API Key Issues

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

1. Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

1. Ensure your URL path starts with signnow. For example:

• Correct: https://api.maton.ai/signnow/user
• Incorrect: https://api.maton.ai/user

Resources

• SignNow API Reference
• SignNow Developer Portal
• SignNow Postman Collection
• SignNow SDKs
• Maton Community
• Maton Support