Hi @avinash, please refrain from posting your API key on this public forum. I'd recommend deactivating this key and activating a new one.
That said, yes it looks like you're using the right endpoint. It's this one: https://developers.hubspot.com/docs/methods/engagements/create_engagement. Where are you expecting to see this call engagement? You should use the ID of the contact and explicitly associate the engagement with a contact by using the associations object in your original POST request.