code: public static String wapPayStr(HttpServletResponse response, AlipayTradeWapPayModel model, String returnUrl,
  			String notifyUrl) throws AlipayApiException, IOException {
  		AlipayTradeWapPayRequest alipayRequest = new AlipayTradeWapPayRequest();// 创建API对应的request
  		alipayRequest.setReturnUrl(returnUrl);
  		alipayRequest.setNotifyUrl(notifyUrl);// 在公共参数中设置回跳和通知地址
  		alipayRequest.setBizModel(model);// 填充业务参数
  		return AliPayApiConfigKit.getAliPayApiConfig().getAlipayClient().pageExecute(alipayRequest).getBody(); // 调用SDK生成表单
  	}
docs: WAP支付
  
  @param response
  {HttpServletResponse}
  @param model
  {AlipayTradeWapPayModel}
  @param returnUrl
  异步通知URL
  @param notifyUrl
  同步通知URL
  @return {String}
  @throws {AlipayApiException}
  @throws {IOException}