HTTP Status Code: 400
Response:
{"errorKey":"server.error.invalid.method.argument","errorCode":2,"timestamp":"2026-05-04T03:01:53.211953598","message":"must not be null"}

Decoded Response (Array):
Array
(
    [errorKey] => server.error.invalid.method.argument
    [errorCode] => 2
    [timestamp] => 2026-05-04T03:01:53.211953598
    [message] => must not be null
)