请求参数如下：

• "appId":"wx88736d7d39e2eda6",
• "pagePath":"pages\/oauth\/authindex?api_version=1.0&mch_id=1575229461&appid=wx5d2be58d77cbcd2e&response_type=code&scope=pay_identity&openid=o_ZbO4kOr51pOc5qlpPPqNQS2_Jg&nonce_str=1596620751sxkI7aW4&sign_type=HMAC-SHA256&sign=0F8933079E6B7CEF0B3B95DC670E394FC178D7176193679612B79B824F14060E"