curl --request POST \
  --url https://api.pricenow.dev/api/checkout/{checkoutId}/items \
  --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,
      "discountCardTypeId": 123
    }
  ]
}
'

import requests

url = "https://api.pricenow.dev/api/checkout/{checkoutId}/items"

payload = { "items": [
        {
            "id": 123,
            "productVariantId": 123,
            "personId": 123,
            "validity": {
                "from": "<string>",
                "to": "<string>"
            },
            "parentItemId": 123,
            "originatedItemId": 123,
            "discountCardTypeId": 123
        }
    ] }
headers = {
    "accept-language": "<accept-language>",
    "pratiq-channel-uuid": "<pratiq-channel-uuid>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'accept-language': '<accept-language>',
    'pratiq-channel-uuid': '<pratiq-channel-uuid>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    items: [
      {
        id: 123,
        productVariantId: 123,
        personId: 123,
        validity: {from: '<string>', to: '<string>'},
        parentItemId: 123,
        originatedItemId: 123,
        discountCardTypeId: 123
      }
    ]
  })
};

fetch('https://api.pricenow.dev/api/checkout/{checkoutId}/items', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.pricenow.dev/api/checkout/{checkoutId}/items",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'items' => [
        [
                'id' => 123,
                'productVariantId' => 123,
                'personId' => 123,
                'validity' => [
                                'from' => '<string>',
                                'to' => '<string>'
                ],
                'parentItemId' => 123,
                'originatedItemId' => 123,
                'discountCardTypeId' => 123
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "accept-language: <accept-language>",
    "pratiq-channel-uuid: <pratiq-channel-uuid>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.pricenow.dev/api/checkout/{checkoutId}/items"

	payload := strings.NewReader("{\n  \"items\": [\n    {\n      \"id\": 123,\n      \"productVariantId\": 123,\n      \"personId\": 123,\n      \"validity\": {\n        \"from\": \"<string>\",\n        \"to\": \"<string>\"\n      },\n      \"parentItemId\": 123,\n      \"originatedItemId\": 123,\n      \"discountCardTypeId\": 123\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("accept-language", "<accept-language>")
	req.Header.Add("pratiq-channel-uuid", "<pratiq-channel-uuid>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.pricenow.dev/api/checkout/{checkoutId}/items")
  .header("accept-language", "<accept-language>")
  .header("pratiq-channel-uuid", "<pratiq-channel-uuid>")
  .header("Content-Type", "application/json")
  .body("{\n  \"items\": [\n    {\n      \"id\": 123,\n      \"productVariantId\": 123,\n      \"personId\": 123,\n      \"validity\": {\n        \"from\": \"<string>\",\n        \"to\": \"<string>\"\n      },\n      \"parentItemId\": 123,\n      \"originatedItemId\": 123,\n      \"discountCardTypeId\": 123\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.pricenow.dev/api/checkout/{checkoutId}/items")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["accept-language"] = '<accept-language>'
request["pratiq-channel-uuid"] = '<pratiq-channel-uuid>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"items\": [\n    {\n      \"id\": 123,\n      \"productVariantId\": 123,\n      \"personId\": 123,\n      \"validity\": {\n        \"from\": \"<string>\",\n        \"to\": \"<string>\"\n      },\n      \"parentItemId\": 123,\n      \"originatedItemId\": 123,\n      \"discountCardTypeId\": 123\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "uuid": "<string>",
    "expiresAt": "2023-11-07T05:31:56Z",
    "startedAt": "2023-11-07T05:31:56Z",
    "lastUpdateAt": "2023-11-07T05:31:56Z",
    "referenceNumber": "<string>",
    "salesChannel": {
      "uuid": "<string>",
      "name": "<string>"
    },
    "checkoutConditions": {
      "defaultValues": {},
      "formDefinition": {},
      "values": {}
    },
    "supportedPaymentMethods": [
      {
        "provider": "DATATRANS",
        "supportsAlias": true,
        "supportsRegistrationAndPayment": true
      }
    ],
    "items": [
      {
        "id": 123,
        "parentItemId": 123,
        "productVariant": {
          "productId": 123,
          "name": "<string>",
          "id": 123,
          "vatRate": 123,
          "attributes": [
            {
              "name": "<string>",
              "identifier": "<string>",
              "value": "<string>",
              "sortOrder": 123,
              "metaInformation": {},
              "translation": "<string>"
            }
          ],
          "translation": "<string>",
          "product": {
            "id": 123,
            "sortOrder": 123,
            "name": "<string>",
            "translation": "<string>",
            "identifier": "<string>",
            "isSubscription": true,
            "standalone": true,
            "hasValidity": true,
            "imageUrl": "<string>",
            "merchant": {
              "identifier": "<string>",
              "timezone": "<string>"
            },
            "category": {
              "id": 123,
              "name": "<string>"
            },
            "slug": "<string>"
          },
          "availableMedia": [
            {
              "description": "<string>",
              "name": "<string>",
              "id": 123,
              "priceComponents": [
                {
                  "price": 123,
                  "productVariant": {
                    "id": 123,
                    "name": "<string>",
                    "translation": "<string>",
                    "vatRate": 123,
                    "productId": 123,
                    "attributes": [
                      {
                        "name": "<string>",
                        "identifier": "<string>",
                        "value": "<string>",
                        "sortOrder": 123,
                        "metaInformation": {},
                        "translation": "<string>"
                      }
                    ]
                  }
                }
              ]
            }
          ]
        },
        "validity": {
          "from": "<string>",
          "to": "<string>"
        },
        "parentItem": "<unknown>",
        "childItems": "<array>",
        "listPriceGross": 123,
        "listPriceNet": 123,
        "promoCodeDiscount": 123,
        "autoDiscount": {
          "id": 123,
          "displayName": "<string>",
          "description": "<string>",
          "discount": 123
        },
        "autoDiscountAmount": 123,
        "totalDiscountGross": 123,
        "totalDiscountNet": 123,
        "totalGross": 123,
        "totalNet": 123,
        "vatRate": 123,
        "displayPrice": true,
        "isDeletable": true,
        "requiresPersonalization": true,
        "requiresValidation": true,
        "requiresMedium": true,
        "isConfirmationRequired": true,
        "isFlexTicket": true,
        "isMaxOneTicketPerPerson": true,
        "isUniqueItem": true,
        "supportsWeatherGuarantee": true,
        "hasWeatherGuarantee": true,
        "personFieldsDefinition": {}
      }
    ],
    "currency": "<string>",
    "listPriceGross": 123,
    "listPriceNet": 123,
    "promoCodes": [
      {
        "id": 123,
        "code": "<string>",
        "displayName": "<string>",
        "description": "<string>",
        "discount": 123,
        "valid": true,
        "totalAmount": 123
      }
    ],
    "promoCodeDiscount": 123,
    "subscriptionConfiguration": {
      "startsOn": "2023-11-07T05:31:56Z",
      "nextBillingDate": "2023-11-07T05:31:56Z",
      "hasPickup": true,
      "startConfiguration": "CURRENT_DAY",
      "minimalRunPeriods": 123,
      "renewal": {
        "period": "DAYS",
        "day": null,
        "month": null,
        "daysAmount": 123
      }
    },
    "autoDiscounts": [
      {
        "id": 123,
        "displayName": "<string>",
        "description": "<string>",
        "discount": 123
      }
    ],
    "autoDiscountAmount": 123,
    "totalDiscountGross": 123,
    "totalDiscountNet": 123,
    "totalSubscriptionGross": 123,
    "totalSubscriptionNet": 123,
    "donation": {
      "type": "DONATION",
      "amount": 123
    },
    "totalGross": 123,
    "totalNet": 123,
    "requiresOwner": true,
    "requiresBillingAddress": true,
    "requiresShippingAddress": true,
    "billingAddress": {
      "id": 123,
      "addressLine1": "<string>",
      "addressLine2": "<string>",
      "zip": "<string>",
      "city": "<string>",
      "state": "<string>",
      "countryCode": "<string>",
      "purpose": []
    },
    "shippingAddress": {
      "id": 123,
      "addressLine1": "<string>",
      "addressLine2": "<string>",
      "zip": "<string>",
      "city": "<string>",
      "state": "<string>",
      "countryCode": "<string>",
      "purpose": []
    },
    "paymentMethod": {
      "provider": "EGUMA",
      "type": "voucher",
      "id": 123,
      "isDefault": true,
      "code": "<string>"
    },
    "vouchers": [
      {
        "code": "<string>",
        "amount": 123
      }
    ],
    "canUsePromoCodes": true,
    "canUseVouchers": true,
    "metadata": {
      "weatherGuarantee": {}
    }
  }
}