code: public String wapPay(WapPayDetail wapPayDetail){
          Map<String, String> wapPayParams = buildWapPayParams(wapPayDetail);
          return buildPayForm(wapPayParams);
      }
docs: WAP支付
  @param wapPayDetail 支付字段信息
  @return 自动提交表单(可直接输出到浏览器)