Custom App

Custom App allows you to send Talkable data to a desired destination such as your site, ESP, CDP. Talkable will send a request with data to the Custom App URL for each customer’s event specified in the Custom App settings.

Webhook Signature Verification

The x-talkable-signature header is included in each request and contains a signature that you have to verify to make sure the request is not compromised.

Talkable generates the signature using a Base64 encoded hash-based message authentication code (HMAC) with SHA-256.

To verify the signature, you should complete the following steps:

1. Prepare the payload_json string

Create a JSON string from the payload of the request.

2. Determine the expected signature

  • Compute an hex encoded HMAC with the SHA256 hash function. Use the Webhook security key as a key, and use the payload_json string as a message.

  • Encode a computed hash with Base64

Your Talkable Webhook security key can be found in the Webhook set up page by navigating to Menu then Webhooks.

Webhooks Menu Item
Webhook Security Key

3. Compare the signatures

Compare the signature from the header with your calculated signature.



require 'base64'
require 'openssl'
require 'active_support/security_utils'

WEBHOOK_SECRET_KEY = 'my_webhook_secret'

def verify_webhook(data, header_signature)
  calculated_signature = Base64.strict_encode64(OpenSSL::HMAC.hexdigest('sha256', WEBHOOK_SECRET_KEY, data))
  ActiveSupport::SecurityUtils.secure_compare(calculated_signature, header_signature)


const crypto = require('crypto');

const WEBHOOK_SECRET_KEY = 'my_webhook_secret';

function verifyWebhook(data, headerSignature) {
    // Calculate HMAC
    const calculatedSignature = btoa(crypto
        .createHmac('sha256', WEBHOOK_SECRET_KEY)

    return crypto.timingSafeEqual(
        Buffer.from(calculatedSignature, 'base64'),
        Buffer.from(headerSignature, 'base64')