How do I update the priority of an existing jira issue?

[Wellbees Support]

https://mywebsite.atlassian.net/rest/api/3/priority/issueKey

{"update":{"priority":[{"set":{"Id" : "1"}}]}} or

{"update":{"priority":[{"set":{"name" : "Highest"}}]}}

I mentioned both methods I tried above, but I'm getting an error

the error i got : 

{

    "errorMessages": [

        "The request body parameters are missing."

    ],

    "errors": {}

}