curl --request POST \
  --url http://{host}:{port}/{contextPath}/task/{id}/bpmnError \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "errorCode": "bpmn-error-543",
  "errorMessage": "anErrorMessage",
  "variables": {
    "aVariable": {
      "value": "aStringValue",
      "type": "String"
    },
    "anotherVariable": {
      "value": true,
      "type": "Boolean"
    }
  }
}
'

{
  "type": "<string>",
  "message": "<string>",
  "code": 123
}