Promise which resolves to an object representing the current user's cart. When calling getCart, the cart property will be overwritten by the data fetched.
{
"total": 0,
"subtotal": 0,
"tax": 0,
"shipping": 0,
"items": [
{
"sku": "string",
"quantity": 0,
"shortDescription": "string",
"name": "string",
"price": 0,
"tax": 0,
"subTotal": 0,
"total": 0
}
]
}