curl --request POST \
  --url https://api.bold-factory.com/v1/items/products/{productReference}/properties \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "propertyReference": "<string>"
}
'

{
  "productId": "<string>",
  "product": {
    "id": "<string>",
    "externalReference": "<string>",
    "code": "<string>",
    "name": "<string>",
    "description": "<string>",
    "deletedAt": "2023-11-07T05:31:56Z",
    "createdAt": "2023-11-07T05:31:56Z",
    "createdBy": "<string>",
    "lastModifiedAt": "2023-11-07T05:31:56Z",
    "lastModifiedBy": "<string>"
  },
  "propertyId": "<string>",
  "property": {
    "id": "<string>",
    "externalReference": "<string>",
    "name": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "createdBy": "<string>",
    "lastModifiedAt": "2023-11-07T05:31:56Z",
    "lastModifiedBy": "<string>"
  }
}