Updates an existing cart or creates new cart as per provided model.

curl --request PUT \
     --url http://localhost:65349//api/episerver/v2.0/carts/{cartId} \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '{
     "Name": "",
     "Market": "",
     "Currency": "",
     "Shipments": [
     {
     "LineItems": [
     {
     "Quantity": ""
     }
     ]
     }
     ]
     }'