function UseCase3()
{
//Create a new shopping cart object
$merchant_id = "";
//Your Merchant ID
$merchant_key = "";
//Your Merchant Key
$server_type = "sandbox";
$cart = new GoogleCart($merchant_id, $merchant_key, $server_type);
//Add items to the cart
$item1 = new GoogleItem("Dry Food Pack AA1453", " pack of highly nutritious dried food for emergency", 1, 35);
$item2 = new GoogleItem("MegaSound 2GB MP3 Player", "Portable MP3 player - stores 500 songs", 1, 178);
$item3 = new GoogleItem("AA Rechargeable Battery Pack", "Battery pack containing four AA rechargeable batteries", 1, 12);
$cart->AddItem($item1);
$cart->AddItem($item2);
$cart->AddItem($item3);
//Set request buyer phone
$cart->SetRequestBuyerPhone("true");
//Add merchant calculations options
$cart->SetMerchantCalculations("https://www.example.com/shopping/merchantCalc", "true", "true", "true");
$ship = new GoogleShipping("merchant-calc", "merchant-calculated", 5, "USD", "ALL");
$ship->SetAllowedStateAreas(array("NY", "CA"));
$cart->AddShipping($ship);
$tax_rule = new GoogleTaxRule("default", 0.2);
$tax_rule->SetStateAreas(array("CA", "NY"));
$tax_table = new GoogleTaxTable("default");
$tax_table->AddTaxRules($tax_rule);
$cart->AddTaxTables($tax_table);
//Display XML data
echo htmlentities($cart->GetXML());
//Display a disabled, small button with a white background
echo $cart->CheckoutButtonCode("small", "white", "disabled");
}
