curl --request POST \
  --url https://api.pricenow.dev/api/booking/products/{productId}/journey/options/{formElementId} \
  --header 'Content-Type: application/json' \
  --header 'accept-language: <accept-language>' \
  --header 'pratiq-channel-uuid: <pratiq-channel-uuid>' \
  --data '
{
  "items": [
    {
      "id": 123,
      "productVariantId": 123,
      "personId": 123,
      "validity": {
        "from": "<string>",
        "to": "<string>"
      },
      "parentItemId": 123,
      "originatedItemId": 123
    }
  ]
}
'

{
  "data": {
    "options": [
      {
        "value": {
          "from": "<string>",
          "to": "<string>"
        },
        "availableCapacity": {
          "kind": "range",
          "min": 123,
          "max": 123
        },
        "label": "<string>",
        "isAvailable": true
      }
    ],
    "pagination": {
      "page": 123,
      "pageSize": 123,
      "totalCount": 123
    },
    "kind": "validities",
    "hasCapacities": true
  }
}