> ## Documentation Index > Fetch the complete documentation index at: https://docs.godiligent.ai/llms.txt > Use this file to discover all available pages before exploring further. # Add Document > Add supporting documents to a CDD case ## OpenAPI ````yaml POST /cdds/{id}/documents openapi: 3.0.1 info: version: 1.5.0 title: Diligent description: > Download Postman collection [here](https://docs.godiligent.ai/files/postman_collection.json). servers: - url: https://api.godiligent.ai description: Production - url: https://api.sandbox.godiligent.ai description: Sandbox security: - xApiKey: [] tags: - name: CDD description: Customer Due Diligence - name: Company description: Company Information - name: Blocked Companies description: Manage blocked companies - name: Monitorings description: Website monitoring and alerts for changes and risks - name: Webhooks description: > ## How to Secure Webhook Deliveries To ensure that webhook payloads are securely transmitted and verified. This guide explains how to configure and validate webhook deliveries using a shared secret. ### How It Works When setting up a webhook, a secret is configured on both the sender (our system) and the receiver (your endpoint). Each webhook payload is signed using this secret, allowing the receiver to verify its authenticity. #### Step 1: Configuring Your Webhook Secret 1. When creating a webhook in our system, specify a unique secret key. This secret should be a strong, randomly generated string. 2. Store this secret securely on your server; it should never be exposed publicly. #### Step 2: Receiving Webhook Payloads When your server receives a webhook event, the request will include an `X-Signature` header containing a HMAC signature of the payload. Example header: ``` X-Signature: sha256=abcdef1234567890... ``` #### Step 3: Validating the Webhook Signature To verify the webhook payload: 1. Retrieve the `X-Signature` value from the request headers. 2. Compute the HMAC SHA-256 signature of the request payload using your webhook secret. 3. Compare the computed signature with the one in the `X-Signature` header. 4. If they match, the webhook is valid. #### (Python) ```python import hashlib import hmac import json def verify_webhook_signature(secret, payload, signature): computed_signature = hmac.new(secret.encode(), payload.encode(), hashlib.sha256).hexdigest() expected_signature = f"sha256={computed_signature}" return hmac.compare_digest(expected_signature, signature) # Example usage: secret = "your_webhook_secret" payload = json.dumps({"event": "example"}) received_signature = "sha256=abcdef1234567890..." if verify_webhook_signature(secret, payload, received_signature): print("Valid webhook received!") else: print("Invalid webhook signature!") ``` #### (JavaScript) ```javascript const crypto = require('crypto'); function verifyWebhookSignature (secret, payload, signature) { const computedSignature = `sha256=${crypto.createHmac('sha256', secret) .update(payload) .digest('hex')}`; return crypto.timingSafeEqual(Buffer.from(computedSignature), Buffer.from(signature)); } // Example usage: const secret = "your_webhook_secret"; const payload = JSON.stringify({ event: "example" }); const receivedSignature = "sha256=abcdef1234567890..."; if (verifyWebhookSignature(secret, payload, receivedSignature)) { console.log("Valid webhook received!"); } else { console.log("Invalid webhook signature!"); } ``` #### Security Considerations - Always use HTTPS to prevent interception of webhook payloads. - Reject webhook requests that fail signature validation. - Rotate secrets periodically to enhance security. By following this guide, you ensure that webhook deliveries are secure and trusted. - name: Instant Screening (experimental) description: Instant Website Screening API - name: Name Screening description: Name screening search, alert management and remediation paths: /cdds/{id}/documents: post: tags: - CDD summary: Add document to CDD description: Add document to CDD parameters: - name: id in: path description: The id of the cdd request required: true schema: type: string example: d6e3b214-30b1-4401-a1b8-a1bd3c6a84e4 requestBody: content: multipart/form-data: schema: required: - type - file properties: type: type: string description: The type of the document enum: - PROOF_OF_ADDRESS - SHAREHOLDERS_LIST - ARTICLES_OF_INCORPORATION example: PROOF_OF_ADDRESS file: type: string format: binary description: The file to upload responses: '200': description: OK content: application/json: schema: $ref: '#/components/schemas/Document' '400': description: Bad Request '401': description: Unauthorized '403': description: Forbidden '404': description: Not found '500': description: Internal Server Error security: - xApiKey: [] components: schemas: Document: type: object properties: id: type: string description: The id of the document example: doc_123 created_at: type: string format: ISO8601 description: The date the document was created example: '2023-04-30T23:50:51.222Z' file_name: type: string description: The name of the document example: proof_of_address.pdf file_type: type: string description: mime type of the file enum: - application/pdf example: application/pdf type: type: string description: The type of the document enum: - CHRONOLOGICAL_EXTRACT - SHAREHOLDER_LIST - REGISTRY_EXCERPT - INCORPORATION - OWNERSHIP_AND_SHAREHOLDING_CHANGES - OFFICER_CHANGES - FINANCIAL_STATEMENTS - ADDRESS_AND_STRUCTURAL_CHANGES example: INCORPORATION url: type: string description: The URL to download the document example: >- https://example-bucket.s3.eu-central-1.amazonaws.com/placeholder-folder/sample-document.pdf securitySchemes: xApiKey: type: apiKey name: X-API-KEY in: header ````