Getting a 405 trying to transition an issue via REST API

[Mike]

I am at a loss trying to figure out why I'm getting a 405:

for issue in issues:
    issue_key = issue["key"]
    issue_type = issue["fields"]["issuetype"]["name"]
    resolution = "Fixed" if issue_type == "Bug" else "Done"

    payload = json.dumps({"issueIdOrKey": issue_key,
                          "transition": {
                              "id": "71"
                          },
                          "fields": {
                              "resolution": {
                                  "name": resolution
                              }
                          }})

    r = requests.put("https://<domain>.atlassian.net/rest/api/3/issue/" + issue_key + '/transitions',
                     auth=auth_string,
                     headers={"Content-Type": "application/json",
                              "Accept": "application/json"},
                     data=payload)

    print(r.status_code)

I've verified via the transitions GET endpoint that transition 71 is the id for the transition whose status I want, and the resolution value is being populated correctly. I've also tried using both "fields" and "update," as well as both resolution name and id.

[Mike · Accepted solution]

Figured it out...was using PUT instead of POST  (－‸ლ)