All API requests should contain .
PATCH /customFields/{CustomFieldId}
{
"assignedCategoryIds": [],
"defaultValue": "Everything fine",
"id": 26707,
"isHidden": false,
"isRequired": false,
"isSensitiveData": false,
"name": "Client Comment",
"placeholder": "Client Comment",
"possibleValues": null,
"type": "text_input"
}
{
"data": {
"assignedCategoryIds": [],
"defaultValue": "Everything fine",
"id": 26707,
"isHidden": false,
"isRequired": false,
"isSensitiveData": false,
"name": "Client Comment",
"placeholder": "Client Comment",
"possibleValues": [],
"type": "text_input"
},
"errorCode": -1,
"errorText": null
}