Cart mutations

[kidunot89]

Description

Mutations for manipulating the Cart.

Mutations

• addItem - adds an item to the cart
• updateItem - modifies an item in the cart
• removeItem - removes an item from the cart
• removeItems - removes multiple or all items from the cart
• addCoupon - adds a coupon to the cart
• updateCoupon - modifies a coupon on the cart
• removeCoupon - removes a coupon from the cart
• removeCoupons - removes multiple or all coupon from the cart
• clearCart - removes all coupons and items from the cart.