Webhooks

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Overview

Webhooks instantly inform your application about significant events, such as payroll submissions or updates, without the need for polling.

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Use Cases:

• Alerting when users submit or create payroll data. This use case can be handled by subscribing for event of type user-payroll-submitted
• Notifying upon successful account linkages. Not yet supported as event type.
• Triggering actions after data updates. Not yet supported as event type.

Webhooks are system-wide meaning subscriptions are not limited to specific users or accounts. For example, if any user updates their payroll with the user-payroll-submitted subscription enabled, a webbook will be delivered with the respective user information enclosed.

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Quick Reference:

• Webhooks List: Detailed descriptions of all events you can subscribe to.
• Setup Guide: Instructions for subscribing and managing webhooks.

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Supported Event:

• user-payroll-submitted - notifies when any user creates an entry with new payroll data. Includes the payroll data entry as json if include_payload is set in the configuration.
• No more events are supported at the moment.

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Setting Up Webhooks

Create a webhook by sending a POST request. Specify which events to monitor and where to send notifications.

curl --request POST \
  --url https://api.sandbox.goteal.co/webhooks \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <api-key>' \
  --data '{
    "events": ["user-payroll-submitted", "user-payroll-created"],
    "name": "user-payroll-submitted",
    "signing_secret": "very-secret",
    "encryption_key": "St/73LZ1xHkwX5TanL7V+YAVczn4acozPf3cFySKQXI=",
    "url": "https://webhooks.site"
  }'

• events: Choose events like user-payroll-submitted for targeted notifications.
• name: Label your webhook for easier management.
• url: Your endpoint to receive webhook payloads.
• signing_secret: (Optional) A secret for secure webhook verification.
• encryption_key: (Optional) A Base64-encoded 32-byte key used to encrypt webhook payloads.

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Verifying Webhooks

If the optional signing_secret was provided in the webhook subscription, it can be used to validate incoming webhook signatures, ensuring data integrity and authenticity.

When encryption is enabled, the message is first encrypted and then signed. Therefore, the signature should be verified against the encrypted message, not the decrypted content.

To verify if a received webhook event is authentic:

• Encode the webook payload with the signing_secret using HMAC-SHA512. You can then check that the result of this encoding matches the contents in the X-Teal-Signature header. If it matches then the webhook received is genuine. Example verification:

If your signing_secret was mysecret and you received the following webhook payload:

{
    "event": "user-payroll-submitted",
    "user_id": "4708334c-70b3-437d-8e46-91ff5c9a8d7d",
    "timestamp": "2024-04-04T12:00:00.00Z"
}

The signature to check against would be:

"X-Teal-Signature" : "a30540779107a19069257432b775b74b16b32214616638fae2e6027a41a3f2dfb08f44daf3862c335d08fb83501fc769f73d49a1cb137f96f31c6a7db412c197"

Example of verifying signature:

const crypto = require('crypto');

// The signature as "X-Teal-Signature" header
const receivedTealSignature = '...'; 
const client_secret = 'my little secret';
const requestBody = '...'; // Your request body here

// Make sure to use the raw requestBody when validating the signature.
var signature = crypto
  .createHmac('sha512', client_secret)
  .update(requestBody)
  .digest('hex');

if (receivedTealSignature === signature) {
    console.log('Signature is valid');
} else {
    console.log('Signature is invalid');
}

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Generating Encryption Keys

If you want to use encrypted webhooks, you’ll need to provide a 32-byte encryption key encoded in Base64 when creating your webhook. Here’s how to generate a secure random key in different languages:

const crypto = require('crypto');

// Generate a random 32-byte key
const encryptionKey = crypto.randomBytes(32);

// Encode the key as Base64 for use with the API
const encryptionKeyBase64 = encryptionKey.toString('base64');
console.log('Encryption Key:', encryptionKeyBase64);
// Example output: St/73LZ1xHkwX5TanL7V+YAVczn4acozPf3cFySKQXI=

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Decrypting Webhook Payloads

When you provide an encryption_key, the webhook payload will be encrypted using AES/GCM/NoPadding. To decrypt:

1. The encrypted payload is sent in the request body
2. The initialization vector is provided in the X-Teal-Encryption-IV header (Base64 encoded)

Here’s how to decrypt the payload in different languages:

const crypto = require('crypto');

function decrypt(
    encryptedBase64,
    ivBase64,
    encryptionKeyBase64
) {
    const encryptionKey = Buffer.from(encryptionKeyBase64, 'base64');
    const iv = Buffer.from(ivBase64, 'base64');
    const encryptedBuffer = Buffer.from(encryptedBase64, 'base64');

    // Extract the auth tag (last 16 bytes) and ciphertext
    const authTag = encryptedBuffer.subarray(encryptedBuffer.length - 16);
    const ciphertext = encryptedBuffer.subarray(0, encryptedBuffer.length - 16);

    const decipher = crypto.createDecipheriv('aes-256-gcm', encryptionKey, iv);
    decipher.setAuthTag(authTag);
    let decrypted = decipher.update(ciphertext);
    try {
        const final = decipher.final();
        if (final.length > 0) {
            decrypted = Buffer.concat([decrypted, final]);
        }

        const payload = JSON.parse(decrypted.toString('utf8'));
        console.log('Decrypted payload:', payload);
    } catch (error) {
        console.error('Decryption failed:', error);
    }
}

decrypt(
    webhookRequest.body,
    webhookRequest.headers['x-teal-encryption-iv'],
    yourSecretStorage.base64EncryptionKey
)

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Webhook Management

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Viewing subscriptions

List your current webhooks with a simple GET request to our webhook endpoint GET /webhooks.

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Deleting subscriptions

Unsubscribe using the webhook ID in the request DELETE /webhooks/{webhook_id}

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Best Practices

• Secure Endpoints: Ensure your webhook URL is HTTPS-secured to safeguard transmitted data.
• Manage Secrets: Keep your signing_secret and encryption_key confidential.
• Use Encryption: Consider using the encryption feature when your team doesn’t control HTTPS termination and you want payloads to be decrypted only by applications possessing the encryption key. As an example, this could help prevent sensitive or GDPR-regulated information from being logged in systems not designed to handle such data (there might be more cases for your specific situation).
• Alternative to Encryption: As an alternative to encryption, consider disabling the payload in webhooks by not setting include_payload in your webhook configuration.
• Regular Review: Periodically check your webhook subscriptions and adjust as needed to match your application’s requirements.

Leverage our webhooks to make your application more dynamic and responsive to changes without the overhead of continuous polling.

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Webhook Example

Example of webhook request body configured to include the payload by setting "include_payload": "true" in POST /webhooks request body.

If the payroll data comes from uploading a payslip the account_id whould be null but document_external_id and document_filename would be populated

is related to uploading a payslip.

{
  "event": "user-payroll-submitted",
  "user_id": "e9b7676b-f107-429c-8d17-cf3fd1362fd3",
  "timestamp": "2024-04-17T13:56:03.277Z",
  "entry_id": "cc48a12c-0e98-47aa-b281-f203403470d0",
  "account_id": "f68961c9-a083-4bfd-a3c6-0ae169b48f35",
  "payload": {
    "entry_id": "cc48a12c-0e98-47aa-b281-f203403470d0",
    "account_id": "f68961c9-a083-4bfd-a3c6-0ae169b48f35",
    "payroll_submissions": [
      {
        "id": "0187c66e-e7e5-811c-b006-2232f00f426a",
        "account_id": "f68961c9-a083-4bfd-a3c6-0ae169b48f35",
        "entry_id": "cc48a12c-0e98-47aa-b281-f203403470d0",
        "created_at": "2024-04-17T13:56:03.118Z",
        "document_external_id": null,
        "document_filename": null,
        "identity_information": {
          "name": "Jane Doe",
          "date_of_birth": "1990-04-01",
          "address": {
            "street": "123 Main St",
            "county": "Anyshire",
            "city": "Anycity",
            "post_code": "AB12 3CD",
            "country": "Countryland"
          },
          "email": "jane.doe@example.com",
          "phone": "+1234567890",
          "NI_number": "AB123456C",
          "employment_information": {
            "employer_name": "Acme Corp",
            "role": "Software Developer",
            "type": "Full-Time",
            "status": "Active",
            "start_date": "2018-06-01",
            "leave_date": null
          },
          "income_information": {
            "pay_date": "2024-02-15",
            "pay_interval_start": "2024-02-01",
            "pay_interval_end": "2024-02-15",
            "pay_frequency": "weekly",
            "earnings": {
              "gross_pay": 2000,
              "net_pay": 1500,
              "base_salary": 1900,
              "bonus": 100
            },
            "deductions": {
              "income_tax": 300,
              "employee_ni": 150,
              "employee_pension": 50,
              "total_deductions": 500
            }
          }
        }
      }
    ]
  }
}