You can use Flock's incoming webhook to send notifications to a Flock channel from WHMCS notifications.

  1. Navigate to the Flock Developer Dashboard at
  2. Sign in with your Flock account and click Webhooks on the left.
  3. Choose to Add an Incoming Webhook.
  4. Select the Channel where you want incoming messages to be posted.
  5. Give the webhook a name and an icon that will be used to post messages in Flock.
  6. Click Save and Generate URL. Copy the URL that is generated.