Data transfer in application/json format:
            
            data: {
               title: "Exhibition organization",
               isPrivate: false,
               customFieldList: [{1: "value for text custom field with id = 1"}]
            }
            

application/json

{
  "status": 0,
  "response": {
    "createBy": {
      "id": "00000000-0000-0000-0000-000000000000",
      "displayName": "Mike Zanyatski",
      "title": "Manager",
      "avatarSmall": "url to small avatar",
      "profileUrl": ""
    },
    "created": "2022-10-07T10:03:01.4878919Z",
    "title": "Exhibition organization",
    "isClosed": false,
    "isPrivate": false,
    "canEdit": true,
    "customFields": [
      {
        "entityId": 14523423,
        "label": "Birthdate",
        "fieldValue": "2022-10-07T10:03:01.4878919Z",
        "fieldType": 5,
        "position": 10,
        "mask": "",
        "id": 0
      }
    ],
    "id": 0
  }
}

text/xml

<result>
  <status>0</status>
  <response>
    <createBy>
      <id>00000000-0000-0000-0000-000000000000</id>
      <displayName>Mike Zanyatski</displayName>
      <title>Manager</title>
      <avatarSmall>url to small avatar</avatarSmall>
      <profileUrl></profileUrl>
    </createBy>
    <created>2022-10-07T10:03:01.4878919Z</created>
    <title>Exhibition organization</title>
    <isClosed>false</isClosed>
    <isPrivate>false</isPrivate>
    <canEdit>true</canEdit>
    <customFields>
      <entityId>14523423</entityId>
      <label>Birthdate</label>
      <fieldValue>2022-10-07T10:03:01.4878919Z</fieldValue>
      <fieldType>5</fieldType>
      <position>10</position>
      <mask></mask>
      <id>0</id>
    </customFields>
    <id>0</id>
  </response>
</result>