expiryTime (string): The expiration time of the cart.
user (object): Details of the user associated with the cart, including ID, verification status, and email.
event (object): Details of the event associated with the cart, including ID, name, year, number, and slug.
promotionCodes (array): An array of promotion codes associated with the cart.
items (array): An array of items in the cart, each containing details such as ID, order ID, article details, promotion codes, voucher code, price, registration data, legitimation details, timeslots, etc.
totals (array): An array containing the original and actual total prices of the cart.
isImmutable (boolean): Indicates if the cart is immutable.
isPaymentImmutable (boolean): Indicates if the payment for the cart is immutable.
isLegitimationImmutable (boolean): Indicates if the legitimation for the cart is immutable.
isRegistrationImmutable (boolean): Indicates if the registration for the cart is immutable.
isAmountImmutable (boolean): Indicates if the amount for the cart is immutable.
isRegistrationOnly (boolean): Indicates if the cart allows only registration without payment.
isRegistrationRequired (boolean): Indicates if registration is required for the cart.
isLegitimationRequired (boolean): Indicates if legitimation is required for the cart.
isPaymentRequired (boolean): Indicates if payment is required for the cart.
paymentProvider (object): Details of the payment provider associated with the cart, including expiration, redirect URL, transaction token, payment methods, configuration, etc.
buyerPerson (object): Details of the buyer associated with the cart, including email, first name, last name, company, salutation, VAT ID, address, survey ID, and validity status.
order (object): Details of the order associated with the cart, including ID, order date, and order number.
status (string): The status of the cart.
culture (string): The culture associated with the cart.