POST update data to EventBrite API using Guzzle

Question

I'm able to add Events using post with the following code:

//Create client
$client = new Client([
    'base_uri' => 'https://www.eventbriteapi.com/v3/',
]);

$params = [
  'event.name.html' => $this->Name,
  'event.description.html' => $this->Description,
  'event.listed'  => false,
  'event.start.utc'  => $this->StartTime,
  'event.start.timezone'  => 'Europe/London',
  'event.end.utc'  => $this->EndTime,
  'event.end.timezone'  => 'Europe/London',
  'event.currency'  => 'GBP'
];

try {
  //Send new event request
  $res = $client->request('POST', "events/", [
    'query' => ['token' => env('EVENTBRITE_TOKEN', '')],
    'form_params' => $params
  ]);
} catch (GuzzleException $e) {
  return false;
}

However when I try to update the event using the ID created in step one and the following code:

//Send update event request
$res = $client->request('POST', "events/$this->EventBriteID", [
  'query' => ['token' => env('EVENTBRITE_TOKEN', '')],
  'form_params' => $params
]);

It doesn't update the event. The request looks successful. Status 200 is returned a long with the event object, however none of the data is updated. The information stays the same as was submitted when the event was created. What am I doing wrong, I'm finding it hard to debug because the endpoint is returning a 200 status.

The request works fine in Postman, so i'm obviously doing something wrong in Guzzle.

EDIT

As requested output of $response->request()

Client {#289 ▼
  -config: array:8 [▼
    "base_uri" => Uri {#298 ▼
      -scheme: "https"
      -userInfo: ""
      -host: "www.eventbriteapi.com"
      -port: null
      -path: "/v3/"
      -query: ""
      -fragment: ""
    }
    "handler" => HandlerStack {#165 ▼
      -handler: StreamHandler {#292 ▼
        -lastHeaders: []
      }
      -stack: array:4 [▼
        0 => array:2 [▼
          0 => Closure {#293 ▼
            class: "GuzzleHttp\Middleware"
            parameters: {▼
              $handler: {▼
                typeHint: "callable"
              }
            }
            file: "/home/user/mysite/vendor/guzzlehttp/guzzle/src/Middleware.php"
            line: "54 to 69"
          }
          1 => "http_errors"
        ]
        1 => array:2 [▼
          0 => Closure {#296 ▼
            class: "GuzzleHttp\Middleware"
            parameters: {▼
              $handler: {▼
                typeHint: "callable"
              }
            }
            file: "/home/user/mysite/vendor/guzzlehttp/guzzle/src/Middleware.php"
            line: "148 to 150"
          }
          1 => "allow_redirects"
        ]
        2 => array:2 [▼
          0 => Closure {#295 ▼
            class: "GuzzleHttp\Middleware"
            parameters: {▼
              $handler: {▼
                typeHint: "callable"
              }
            }
            file: "/home/user/mysite/vendor/guzzlehttp/guzzle/src/Middleware.php"
            line: "27 to 43"
          }
          1 => "cookies"
        ]
        3 => array:2 [▼
          0 => Closure {#286 ▼
            class: "GuzzleHttp\Middleware"
            parameters: {▼
              $handler: {▼
                typeHint: "callable"
              }
            }
            file: "/home/user/mysite/vendor/guzzlehttp/guzzle/src/Middleware.php"
            line: "216 to 218"
          }
          1 => "prepare_body"
        ]
      ]
      -cached: null
    }
    "allow_redirects" => array:5 [▼
      "max" => 5
      "protocols" => array:2 [▼
        0 => "http"
        1 => "https"
      ]
      "strict" => false
      "referer" => false
      "track_redirects" => false
    ]
    "http_errors" => true
    "decode_content" => true
    "verify" => true
    "cookies" => false
    "headers" => array:1 [▼
      "User-Agent" => "GuzzleHttp/6.2.1 PHP/7.0.8-0ubuntu0.16.04.3"
    ]
  ]
}

Answer 1

So after many hours of despair, I finally fixed it. The issue was a missing trailing slash on the endpoint url:

$res = $client->request('POST', "events/$this->EventBriteID", []);

changed to

$res = $client->request('POST', "events/$this->EventBriteID/", []);

Now works as expected.