Webhook not firing on merged accounts

Webhook not firing on merged accounts

When a user merges two accounts in Zoho CRM we're not getting any webhooks related to either the deleted account or the account the data was merged into.  Can you please advise the steps required to set up that webhook.

Our external application needs to know if a user merged 2 accounts and if one of those accounts was being tracked in a 3rd party application and know would be orphaned because it was the deleted of the 2 accounts.