我有问题，我正在尝试将多个项目发送到Paypal，但它显示“订单总数丢失”。-10400错误版本:76.0我正在测试Paypal沙箱我的要求:&AMT=106.72&RETURNURL=http%3A%2F%mydomainname.com%2Fpp%2Fpaypal%2Fprocess.php&CANCELURL=http%3A%2F%mydomainname.com%2Fpp%2Fpaypal%2Fcancel_url.php&L_PAYMENTREQUEST_0_QTY0=3&L_PAYMENTREQUEST_0_AMT0=28.46&L_PAYMENTREQUEST_0_NAM