code: public Wepay init(){
          pays = new Pays(this);
          orders = new Orders(this);
          refunds = new Refunds(this);
          notifies = new Notifies(this);
          bills = new Bills(this);
          if (certs != null && !Strings.isNullOrEmpty(certPasswd)){
              sslSocketFactory = initSSLSocketFactory();
          }
          return this;
      }
docs: 初始化操作
  @return this