We have a custom app that will do this for you. It works like a regular webhook service i.e. you subscribe to it and then it will send you either onTicketCreate or onTicketUpdate event payloads. We have also augmented the payload with some extra information on the ticket. We built it to feed an MS Power Automate flow trigger but it can work with anything.
It uses the request API so typically the rate is 50 requests per minute.
I work with groww.in, one of the Freshdesk customer. We needed little more clarity. We were thinking to have a discussion regarding this with one of your developers over a call. If possible, can we please schedule a call?
The exact answer depends on which platform features you end up using.
If the event listener for onTicketCreate sends HTTP requests to an external API and you use Request Method for that, each installation of the app will be subjected to the Request Method rate limit, which defaults to 50 rpm. Plus, the requests will also be subjected to a default timeout of 6 seconds.