From 79784bf1386eacc5c756b2c4f403d64f060c9e88 Mon Sep 17 00:00:00 2001
From: Su Yijia <crystalremnet@gmail.com>
Date: Thu, 24 Sep 2015 17:32:44 +0800
Subject: [PATCH] add invoke reverse

---
 lib/wx_pay/service.rb | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+), 0 deletions(-)

diff --git a/lib/wx_pay/service.rb b/lib/wx_pay/service.rb
index ea58640..f68f4de 100644
--- a/lib/wx_pay/service.rb
+++ b/lib/wx_pay/service.rb
@@ -66,6 +66,33 @@ module WxPay
       r
     end
 
+    INVOKE_REVERSE_REQUIRED_FIELDS = %i(out_trade_no)
+    def self.invoke_reverse(params)
+      params = {
+        appid: WxPay.appid,
+        mch_id: WxPay.mch_id,
+        nonce_str: SecureRandom.uuid.tr('-', '')
+      }.merge(params)
+
+      check_required_options(params, INVOKE_REVERSE_REQUIRED_FIELDS)
+
+      # 微信退款需要双向证书
+      # https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
+      # https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=4_3
+
+      WxPay.extra_rest_client_options = {
+        ssl_client_cert: WxPay.apiclient_cert.certificate,
+        ssl_client_key: WxPay.apiclient_cert.key,
+        verify_ssl: OpenSSL::SSL::VERIFY_NONE
+      }
+
+      r = invoke_remote "#{GATEWAY_URL}/secapi/pay/reverse", make_payload(params)
+
+      yield(r) if block_given?
+
+      r
+    end
+
 
     private
 
--
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