curl --request POST \
  --url https://api.nuwebgroup.com/v1/events/charities/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "eventId": 1,
  "saleItemData": {
    "pricing": [
      {
        "currencyId": 1,
        "processingFeePercent": 4.5,
        "variablePrice": true,
        "variablePriceMin": 500,
        "variablePriceMax": 2500
      }
    ],
    "attractsGiftAid": true
  },
  "itemData": {
    "name": "Teenage Cancer Trust",
    "description": "Teenage Cancer Trust is a cancer care and support charity in the UK that exists to improve the cancer experience of young people aged 13–24. Founded in 1990, the charity's key service is providing specialist teenage units in NHS hospitals. It also trains and funds staff who are teenage cancer specialists.",
    "externalId": "TCT-FR-2021",
    "website": "https://www.teenagecancertrust.org/"
  }
}
EOF

{
  "data": {
    "type": "saleItems",
    "id": 1,
    "attributes": {
      "attractsGiftaid": false,
      "createdAt": "2021-11-22T11:59:00.000000Z",
      "updatedAt": "2021-11-22T11:59:00.000000Z"
    },
    "relationships": {
      "items": {
        "data": {
          "type": "items",
          "id": 1
        }
      }
    }
  },
  "included": [
    {
      "type": "items",
      "id": 1,
      "attributes": {
        "type": "charity",
        "name": "Teenage Cancer Trust",
        "description": "Teenage Cancer Trust is a cancer care and support charity in the UK that exists to improve the cancer experience of young people aged 13–24. Founded in 1990, the charity's key service is providing specialist teenage units in NHS hospitals. It also trains and funds staff who are teenage cancer specialists.",
        "externalId": "TCT-FR-2021",
        "website": "https://www.teenagecancertrust.org/",
        "createdAt": "2021-11-22T11:59:00.000000Z",
        "updatedAt": "2021-11-22T11:59:00.000000Z"
      }
    }
  ]
}