alipayrequest.setbizcontent("{"
"\"out_trade_no\":\"202025725558236936558899688\","
"\"product_code\":\"fast_instant_trade_pay\","
"\"total_amount\":0.1,"
"\"subject\":\"iphone6 16g\","
"\"body\":\"iphone6 16g\","
//禁用渠道参数,多个使用逗号隔开,例如"disable_pay_channels":"pcredit,moneyfund,debitcardexpress",
"\"disable_pay_channels\":\"pcredit\","
"\"passback_params\":\"merchantbiztype=3c&merchantbizno=2016010101111\""
"}");