ZapSign

Use ZapSign via direct curl calls to create and manage electronic signatures with legal validity.

Official docs: https://docs.zapsign.com.br/english

When to Use

Use this skill when you need to:

• Create documents for electronic signature (PDF, DOCX, or Markdown)
• Add signers to documents with various authentication methods
• Track signing status and get signed documents
• Send automatic notifications via email or WhatsApp
• Collect biometric verification (selfie, document photo, facial recognition)

Prerequisites

1. Sign up at ZapSign (Production) or Sandbox
2. Go to Settings > Integrations > ZAPSIGN API
3. Copy your API token

export ZAPSIGN_API_TOKEN="your-api-token"

Environments

Pricing

• Sandbox: Free for testing (no legal validity)
• Production: Requires API plan, pay per document

Important: When using $VAR in a command that pipes to another command, wrap the command containing $VAR in bash -c '...'. Due to a Claude Code bug, environment variables are silently cleared when pipes are used directly.

bash -c 'curl -s "https://api.example.com" -H "Authorization: Bearer $API_KEY"' | jq .

How to Use

All examples use the sandbox environment. For production, replace sandbox.api.zapsign.com.br with api.zapsign.com.br.

1. Create Document from PDF URL

Create a document for signature from a public PDF URL:

Write to /tmp/zapsign_request.json:

{
  "name": "Employment Contract",
  "url_pdf": "https://example.com/contract.pdf",
  "lang": "en",
  "signers": [
    {
      "name": "John Doe",
      "email": "john@example.com",
      "auth_mode": "assinaturaTela",
      "send_automatic_email": true
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, sign_url: .signers[0].sign_url}'

2. Create Document from Base64

Create a document from base64-encoded PDF:

# First, encode your PDF to base64
BASE64_PDF=$(base64 -i document.pdf)

Write to /tmp/zapsign_request.json:

{
  "name": "Contract",
  "base64_pdf": "${BASE64_PDF}",
  "signers": [
    {
      "name": "Jane Smith",
      "email": "jane@example.com"
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, signers}'

3. Create Document from Markdown

Create a document directly from Markdown text (great for AI integrations):

Write to /tmp/zapsign_request.json:

{
  "name": "Service Agreement",
  "markdown_text": "# Service Agreement\n\nThis agreement is between **Company A** and **Client B**.\n\n## Terms\n\n1. Service will be provided for 12 months\n2. Payment is due monthly\n\n---\n\nSignature: ________________",
  "signers": [
    {
      "name": "Client Name",
      "email": "client@example.com"
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, original_file}'

4. Create Document with Multiple Signers

Create a document with signing order:

Write to /tmp/zapsign_request.json:

{
  "name": "Multi-party Contract",
  "url_pdf": "https://example.com/contract.pdf",
  "signature_order_active": true,
  "signers": [
    {
      "name": "First Signer",
      "email": "first@example.com",
      "order_group": 1,
      "send_automatic_email": true
    },
    {
      "name": "Second Signer",
      "email": "second@example.com",
      "order_group": 2,
      "send_automatic_email": true
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, signature_order_active}'

5. Create Document with Expiration

Create a document with a deadline for signing:

Write to /tmp/zapsign_request.json:

{
  "name": "Limited Time Offer",
  "url_pdf": "https://example.com/offer.pdf",
  "date_limit_to_sign": "2025-12-31T23:59:59Z",
  "signers": [
    {
      "name": "Customer",
      "email": "customer@example.com"
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, date_limit_to_sign}'

6. Get Document Details

Retrieve document status and signer information. Replace <your-document-token> with the actual document token:

bash -c 'curl -s -X GET "https://sandbox.api.zapsign.com.br/api/v1/docs/<your-document-token>/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}"' | jq '{name, status, original_file, signed_file, signers: [.signers[] | {name, status, signed_at}]}''

7. Add Signer to Existing Document

Add a new signer to an existing document. Replace <your-document-token> with the actual document token:

Write to /tmp/zapsign_request.json:

{
  "name": "Additional Signer",
  "email": "additional@example.com",
  "auth_mode": "assinaturaTela",
  "send_automatic_email": true
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/<your-document-token>/add-signer/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, sign_url, status}'

8. Create Document with WhatsApp Notification

Send signing link via WhatsApp (costs credits):

Write to /tmp/zapsign_request.json:

{
  "name": "Contract via WhatsApp",
  "url_pdf": "https://example.com/contract.pdf",
  "signers": [
    {
      "name": "Mobile User",
      "phone_country": "1",
      "phone_number": "5551234567",
      "send_automatic_whatsapp": true,
      "auth_mode": "tokenWhatsapp"
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, signers}'

9. Create Document with Biometric Verification

Require facial recognition during signing:

Write to /tmp/zapsign_request.json:

{
  "name": "High Security Contract",
  "url_pdf": "https://example.com/contract.pdf",
  "signers": [
    {
      "name": "Verified Signer",
      "email": "verified@example.com",
      "selfie_validation_type": "liveness-document-match",
      "require_document_photo": true
    }
  ]
}

Then run:

bash -c 'curl -s -X POST "https://sandbox.api.zapsign.com.br/api/v1/docs/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}" -H "Content-Type: application/json" -d @/tmp/zapsign_request.json' | jq '{token, status, signers: [.signers[] | {name, selfie_validation_type}]}''

10. Delete a Document

Delete a document. Replace <your-document-token> with the actual document token:

bash -c 'curl -s -X DELETE "https://sandbox.api.zapsign.com.br/api/v1/docs/<your-document-token>/" -H "Authorization: Bearer ${ZAPSIGN_API_TOKEN}"'

Authentication Modes

Biometric Validation Types

Document Status

Signer Status

Response Fields

Guidelines

1. Use Sandbox for testing: Always test in sandbox first - it's free and has no legal validity
2. Store tokens: Save token and signers[].token for future API calls
3. File URLs expire: original_file and signed_file URLs expire in 60 minutes
4. Use webhooks: Instead of polling, set up webhooks for real-time notifications
5. WhatsApp costs credits: Each WhatsApp notification costs $0.10
6. Biometrics cost credits: Facial recognition and identity verification require credits
7. Production requires plan: Production environment requires an active API plan