Hey, @v-yueyun-msft!
Aparently this does solve the problem related to delete a person, but it doesn't solve the problem related to update a deal, as I mentioned before that I'm also trying to do. There's no workaround for updating a deal. Simmilarly, updating about anything on Pipedrive through Power Automate faces the same problem. I'm pretty sure I should be able to send an integer as a query key value on a HTTP request, and not being able to do so seems to be a bug. I can't mark your reply as a solution, because we must agree in one thing: the actual problem isn't solved.
If our option is to require different API methods to do the same thing, I'm gonna file a bug somewhere, because Postman can make the exact same request successfully without screwing things up.
Anyways, thank you for your fast replies and for your time, friend!
Perhaps someone else can also contribute with our discussion.
Sincerely,
Luis Aguiar