curl --request POST \
  --url https://api.opencals.com/storefront/cart/extend \
  --header 'X-Cart-Id: <x-cart-id>'

import requests

url = "https://api.opencals.com/storefront/cart/extend"

headers = {"X-Cart-Id": "<x-cart-id>"}

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

print(response.text)

const options = {method: 'POST', headers: {'X-Cart-Id': '<x-cart-id>'}};

fetch('https://api.opencals.com/storefront/cart/extend', 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.opencals.com/storefront/cart/extend",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "X-Cart-Id: <x-cart-id>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.opencals.com/storefront/cart/extend"

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

	req.Header.Add("X-Cart-Id", "<x-cart-id>")

	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.opencals.com/storefront/cart/extend")
  .header("X-Cart-Id", "<x-cart-id>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.opencals.com/storefront/cart/extend")

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

request = Net::HTTP::Post.new(url)
request["X-Cart-Id"] = '<x-cart-id>'

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

{
  "id": "<string>",
  "storeId": "<string>",
  "customerId": "<string>",
  "status": "active",
  "paymentCurrencyCode": "<string>",
  "taxesIncluded": true,
  "expiresAt": "2023-11-07T05:31:56Z",
  "extensionsCount": 123,
  "appliedDiscountCode": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z",
  "subtotal": 100,
  "totalTax": 20,
  "total": 120,
  "appliedDiscounts": [
    {
      "id": "<string>",
      "title": "<string>",
      "totalAmount": 123,
      "code": "<string>"
    }
  ],
  "customer": {
    "id": "123e4567-e89b-12d3-a456-426614174000",
    "externalId": "1234567890",
    "firstName": "John",
    "lastName": "Smith",
    "email": "john.smith@example.com",
    "phone": "+12135550123",
    "password": "<string>",
    "storeId": "store-uuid",
    "language": "en",
    "createdAt": "2023-01-15T10:30:00Z",
    "updatedAt": "2023-02-20T14:15:00Z",
    "emailVerifiedAt": "2023-01-02T00:00:00Z",
    "deletedAt": "2023-06-03T09:45:00Z",
    "isEmailVerified": true,
    "isPasswordSet": true,
    "addresses": [
      {
        "id": "<string>",
        "storeId": "<string>",
        "customerId": "<string>",
        "isDefault": false,
        "createdAt": "2023-11-07T05:31:56Z",
        "updatedAt": "2023-11-07T05:31:56Z",
        "formattedAddress": "123 Main Street, Suite 456, New York, NY, 10001, USA",
        "firstName": "<string>",
        "lastName": "<string>",
        "companyName": "<string>",
        "companyVatNumber": "<string>",
        "addressLine1": "<string>",
        "addressLine2": "<string>",
        "city": "<string>",
        "state": "<string>",
        "postalCode": "<string>",
        "country": "<string>"
      }
    ],
    "defaultAddress": {
      "id": "<string>",
      "storeId": "<string>",
      "customerId": "<string>",
      "isDefault": false,
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z",
      "formattedAddress": "123 Main Street, Suite 456, New York, NY, 10001, USA",
      "firstName": "<string>",
      "lastName": "<string>",
      "companyName": "<string>",
      "companyVatNumber": "<string>",
      "addressLine1": "<string>",
      "addressLine2": "<string>",
      "city": "<string>",
      "state": "<string>",
      "postalCode": "<string>",
      "country": "<string>"
    }
  },
  "items": [
    {
      "id": "<string>",
      "cartId": "<string>",
      "appointmentId": "<string>",
      "originalUnitPrice": 123,
      "discountedUnitPrice": 123,
      "unitTaxAmount": 123,
      "quantity": 1,
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z",
      "deletedAt": "2023-11-07T05:31:56Z",
      "discounts": [
        {
          "discountId": "<string>",
          "title": "<string>",
          "amountPerUnit": 123,
          "valueType": "percentage",
          "value": 123,
          "targetType": "base"
        }
      ],
      "originalSubtotal": 225,
      "totalDiscount": 100,
      "discountedSubtotal": 125,
      "totalTax": 0,
      "discountedTotal": 125,
      "addOnSubtotal": 0,
      "addOnTotalTax": 0,
      "appointment": {
        "id": "123e4567-e89b-12d3-a456-426614174000",
        "name": "1001",
        "productId": "123e4567-e89b-12d3-a456-426614174001",
        "staffMemberId": "123e4567-e89b-12d3-a456-426614174002",
        "locationId": "123e4567-e89b-12d3-a456-426614174003",
        "storeId": "123e4567-e89b-12d3-a456-426614174004",
        "customerId": "123e4567-e89b-12d3-a456-426614174005",
        "externalOrderId": "12345678",
        "externalOrderName": "#1001",
        "from": "2023-06-15T09:00:00Z",
        "to": "2023-06-15T10:00:00Z",
        "addressLine1": "123 Main Street",
        "addressLine2": "Suite 456",
        "city": "New York",
        "state": "NY",
        "postalCode": "10001",
        "country": "USA",
        "displayAddress": "Podcast House, Floor 3, 87 Turmill Street, London, EC1M 5QU",
        "status": "scheduled",
        "internalNote": "Customer requested extra attention for specific needs",
        "createdBy": "customer",
        "reminderSentAt": "2023-06-14T09:00:00Z",
        "numberOfAttendees": 1,
        "createdAt": "2023-06-01T10:30:00Z",
        "updatedAt": "2023-06-02T14:15:00Z",
        "deletedAt": "2023-06-03T09:45:00Z",
        "product": {
          "id": "123e4567-e89b-12d3-a456-426614174000",
          "productId": "123e4567-e89b-12d3-a456-426614174000",
          "externalId": "1234567890",
          "externalVariantId": "9876543210",
          "storeId": "123e4567-e89b-12d3-a456-426614174001",
          "slug": "haircut-basic",
          "scheduleId": "<string>",
          "productPoolId": "<string>",
          "title": "Haircut Service",
          "variantTitle": "Short Hair",
          "description": "<string>",
          "imageId": "<string>",
          "color": "BLUE",
          "price": 250,
          "taxable": false,
          "duration": 3600,
          "allowCustomDuration": false,
          "maxDuration": -1,
          "maxAttendees": 1,
          "maxGuests": 123,
          "allowGuests": false,
          "allowCustomerReschedule": false,
          "allowCustomerCancel": false,
          "rescheduleGap": 123,
          "cancelGap": 123,
          "beforeGap": 123,
          "afterGap": 123,
          "fixedTimes": false,
          "fixedStartTime": "09:00:00",
          "fixedEndTime": "17:00:00",
          "advanceScheduleThreshold": 0,
          "sendConfirmationEmail": true,
          "sendReminderEmail": false,
          "sendFeedbackEmail": false,
          "skipCheckout": false,
          "status": "ACTIVE",
          "createdAt": "<string>",
          "updatedAt": "<string>",
          "deletedAt": "<string>",
          "schedule": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "storeId": "123e4567-e89b-12d3-a456-426614174001",
            "name": "Standard Business Hours",
            "timezone": "UTC",
            "scheduleGap": "every-15-minutes",
            "appointmentsGap": 900,
            "advanceScheduleDays": 60,
            "availabilityType": "recurring",
            "status": "active",
            "createdAt": "2023-01-20T08:30:00Z",
            "updatedAt": "2023-02-15T14:20:00Z",
            "deletedAt": "2023-06-03T09:45:00Z"
          },
          "image": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "externalId": "img_123456",
            "url": "https://storage.example.com/images/product-image.jpg",
            "filename": "product-image.jpg",
            "mime": "image/jpeg",
            "createdAt": "2023-01-01T12:00:00Z",
            "updatedAt": "2023-01-02T12:00:00Z",
            "deletedAt": "2023-01-03T12:00:00Z",
            "storeId": "store-uuid"
          }
        },
        "staffMember": {
          "id": "123e4567-e89b-12d3-a456-426614174000",
          "storeId": "123e4567-e89b-12d3-a456-426614174111",
          "userId": "user-uuid",
          "scheduleId": "123e4567-e89b-12d3-a456-426614174000",
          "imageId": "123e4567-e89b-12d3-a456-426614174000",
          "firstName": "John",
          "lastName": "Doe",
          "email": "john.doe@example.com",
          "slug": "mike",
          "refreshToken": "abc123xyz456",
          "createdAt": "2025-05-01T12:00:00Z",
          "updatedAt": "2025-05-15T14:30:00Z",
          "deletedAt": "2025-06-01T09:15:00Z",
          "schedule": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "storeId": "123e4567-e89b-12d3-a456-426614174001",
            "name": "Standard Business Hours",
            "timezone": "UTC",
            "scheduleGap": "every-15-minutes",
            "appointmentsGap": 900,
            "advanceScheduleDays": 60,
            "availabilityType": "recurring",
            "status": "active",
            "createdAt": "2023-01-20T08:30:00Z",
            "updatedAt": "2023-02-15T14:20:00Z",
            "deletedAt": "2023-06-03T09:45:00Z"
          },
          "image": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "externalId": "img_123456",
            "url": "https://storage.example.com/images/product-image.jpg",
            "filename": "product-image.jpg",
            "mime": "image/jpeg",
            "createdAt": "2023-01-01T12:00:00Z",
            "updatedAt": "2023-01-02T12:00:00Z",
            "deletedAt": "2023-01-03T12:00:00Z",
            "storeId": "store-uuid"
          }
        },
        "location": {
          "id": "123e4567-e89b-12d3-a456-426614174000",
          "storeId": "123e4567-e89b-12d3-a456-426614174001",
          "scheduleId": "123e4567-e89b-12d3-a456-426614174002",
          "title": "Main Office",
          "description": "Our main downtown office location with 3 treatment rooms",
          "slug": "new-york",
          "type": "physical",
          "link": "https://zoom.us/j/123456789",
          "addressLine1": "123 Main Street",
          "addressLine2": "Suite 200",
          "city": "San Francisco",
          "state": "CA",
          "postalCode": "94105",
          "country": "United States",
          "addressPlaceId": "ChIJIQBpAG2ahYAR_6128GcTUEo",
          "latitude": 37.4224764,
          "longitude": -122.0842499,
          "createdAt": "2023-01-20T08:30:00Z",
          "updatedAt": "2023-02-15T14:20:00Z",
          "deletedAt": "2023-03-10T11:45:00Z",
          "address": "<string>",
          "schedule": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "storeId": "123e4567-e89b-12d3-a456-426614174001",
            "name": "Standard Business Hours",
            "timezone": "UTC",
            "scheduleGap": "every-15-minutes",
            "appointmentsGap": 900,
            "advanceScheduleDays": 60,
            "availabilityType": "recurring",
            "status": "active",
            "createdAt": "2023-01-20T08:30:00Z",
            "updatedAt": "2023-02-15T14:20:00Z",
            "deletedAt": "2023-06-03T09:45:00Z"
          },
          "displayAddress": "Podcast House, Floor 3, 87 Turmill Street, London, EC1M 5QU"
        },
        "customAttributes": {
          "source": "widget",
          "party_size": "4"
        }
      },
      "addOnItems": [
        {
          "id": "<string>",
          "cartId": "<string>",
          "cartItemId": "<string>",
          "addOnId": "<string>",
          "originalUnitPrice": 123,
          "discountedUnitPrice": 123,
          "unitTaxAmount": 123,
          "quantity": 1,
          "createdAt": "2023-11-07T05:31:56Z",
          "updatedAt": "2023-11-07T05:31:56Z",
          "deletedAt": "2023-11-07T05:31:56Z",
          "discounts": [
            {
              "discountId": "<string>",
              "title": "<string>",
              "amountPerUnit": 123,
              "valueType": "percentage",
              "value": 123,
              "targetType": "base"
            }
          ],
          "originalSubtotal": 123,
          "totalDiscount": 123,
          "discountedSubtotal": 123,
          "totalTax": 123,
          "discountedTotal": 123,
          "addOn": {
            "id": "123e4567-e89b-12d3-a456-426614174000",
            "externalId": "1234567890",
            "externalVariantId": "9876543210",
            "storeId": "123e4567-e89b-12d3-a456-426614174001",
            "slug": "child-seat",
            "title": "Child Seat",
            "description": "<string>",
            "imageId": "<string>",
            "color": "slate",
            "price": 15,
            "taxable": true,
            "durationMultiplied": false,
            "maxQuantity": 4,
            "status": "active",
            "createdAt": "<string>",
            "updatedAt": "<string>",
            "deletedAt": "<string>",
            "image": {
              "id": "123e4567-e89b-12d3-a456-426614174000",
              "externalId": "img_123456",
              "url": "https://storage.example.com/images/product-image.jpg",
              "filename": "product-image.jpg",
              "mime": "image/jpeg",
              "createdAt": "2023-01-01T12:00:00Z",
              "updatedAt": "2023-01-02T12:00:00Z",
              "deletedAt": "2023-01-03T12:00:00Z",
              "storeId": "store-uuid"
            }
          }
        }
      ]
    }
  ],
  "payments": [
    {
      "id": "<string>",
      "cartId": "<string>",
      "orderId": "<string>",
      "provider": {},
      "providerReference": "<string>",
      "status": "created",
      "amount": 123,
      "currency": "<string>",
      "capturedAmount": 123,
      "authorizedUntil": "2023-11-07T05:31:56Z",
      "clientSecret": "<string>",
      "createdAt": "2023-11-07T05:31:56Z",
      "updatedAt": "2023-11-07T05:31:56Z"
    }
  ],
  "customerFirstName": "<string>",
  "customerLastName": "<string>",
  "customerEmail": "<string>",
  "customerPhone": "<string>",
  "billingFirstName": "<string>",
  "billingLastName": "<string>",
  "billingCompanyName": "<string>",
  "billingCompanyVatNumber": "<string>",
  "billingAddressLine1": "<string>",
  "billingAddressLine2": "<string>",
  "billingCity": "<string>",
  "billingState": "<string>",
  "billingPostalCode": "<string>",
  "billingCountry": "<string>",
  "creditCovered": 123,
  "creditRemaining": 123,
  "creditValueType": "<string>"
}