微信支付沙箱環境對接流程

前者注：對接前導入微信SDK到項目中，微信支付沙箱環境支付不需要掃碼，自動支付成功。

對接流程：

1. 獲取沙箱環境簽名密鑰，獲取方法：

下面獲取沙箱密鑰的示例代碼（in java）：

1. public String getSandboxSignKey() throws Exception{
       WXPay wxPay = new WXPay(this);
       try {
         Map<String, String> params = new HashMap<String, String>();
         //商戶號  
         params.put("mch_id", this.getMchID());
         //隨機數
         params.put("nonce_str", WXPayUtil.generateNonceStr());
         //此處密鑰使用正式環境的密鑰，加密方式只能使用MD5
         params.put("sign", WXPayUtil.generateSignature(params, this.getKey(), WXPayConstants.SignType.MD5));
   
         String strXML = wxPay.requestWithoutCert("/sandboxnew/pay/getsignkey",
                 params, this.getHttpConnectTimeoutMs(), this.getHttpReadTimeoutMs());
   
         Map<String, String> result = WXPayUtil.xmlToMap(strXML);
         System.out.println("retrieveSandboxSignKey:" + result);
         if ("SUCCESS".equals(result.get("return_code"))) {
           return result.get("sandbox_signkey");
         }
         return null;
       } catch (Exception e) {
         System.out.println("獲取sandbox_signkey異常" + e.getMessage());
         return null;
       }
     }

2.獲取到沙箱環境的密鑰後，替換正式的密鑰，調用對應的接口，沙箱環境的接口地址和正式環境的接口地址有所區別，參數都一樣，以下給出沙箱環境的各個api地址：

public static final String SANDBOX_MICROPAY_URL_SUFFIX = "/sandboxnew/pay/micropay";
public static final String SANDBOX_UNIFIEDORDER_URL_SUFFIX = "/sandboxnew/pay/unifiedorder";
public static final String SANDBOX_ORDERQUERY_URL_SUFFIX = "/sandboxnew/pay/orderquery";
public static final String SANDBOX_REVERSE_URL_SUFFIX = "/sandboxnew/secapi/pay/reverse";
public static final String SANDBOX_CLOSEORDER_URL_SUFFIX = "/sandboxnew/pay/closeorder";
public static final String SANDBOX_REFUND_URL_SUFFIX = "/sandboxnew/secapi/pay/refund";
public static final String SANDBOX_REFUNDQUERY_URL_SUFFIX = "/sandboxnew/pay/refundquery";
public static final String SANDBOX_DOWNLOADBILL_URL_SUFFIX = "/sandboxnew/pay/downloadbill";
public static final String SANDBOX_REPORT_URL_SUFFIX = "/sandboxnew/payitil/report";
public static final String SANDBOX_SHORTURL_URL_SUFFIX = "/sandboxnew/tools/shorturl";
public static final String SANDBOX_AUTHCODETOOPENID_URL_SUFFIX = "/sandboxnew/tools/authcodetoopenid";