diff --git a/src/service/WechatWorkService.ts b/src/service/wechatwork.service.ts
similarity index 62%
rename from src/service/WechatWorkService.ts
rename to src/service/wechatwork.service.ts
index ccb7cb4..3a59875 100644
--- a/src/service/WechatWorkService.ts
+++ b/src/service/wechatwork.service.ts
@@ -1,5 +1,7 @@
+import axios, { AxiosRequestConfig } from 'axios'
 import { singleton } from 'decorators/singleton'
 
+const fs = require('fs')
 const WX_API_HOST = 'https://qyapi.weixin.qq.com'
 @singleton
 export class WechatWorkService {
@@ -24,10 +26,14 @@ export class WechatWorkService {
   public async refreshAccessToken() {
     const url = `${WX_API_HOST}/cgi-bin/gettoken`
     // use axios get url
-    let config = {
+    let config: AxiosRequestConfig = {
       method: 'get',
       maxBodyLength: Infinity,
       url,
+      params: {
+        corpid: this.wxCorpId,
+        corpsecret: this.wxCorpSecret,
+      },
     }
     let response = await axios.request(config).then(response => {
       return response.data
@@ -40,6 +46,19 @@ export class WechatWorkService {
    */
   public async fetchApprovalDetail(spNo: string) {
     const url = `${WX_API_HOST}/cgi-bin/oa/getapprovaldetail`
+    let config: AxiosRequestConfig = {
+      method: 'post',
+      url,
+      params: {
+        access_token: this.accessToken,
+      },
+      data: {
+        sp_no: spNo,
+      },
+    }
+    let response = await axios.request(config).then(response => {
+      return response.data
+    })
   }
 
   /**
@@ -49,5 +68,17 @@ export class WechatWorkService {
    */
   public async fetchFile(mediaId: string) {
     const url = `${WX_API_HOST}/cgi-bin/media/get`
+    let config: AxiosRequestConfig = {
+      method: 'get',
+      url,
+      responseType: 'stream',
+      params: {
+        access_token: this.accessToken,
+        media_id: mediaId,
+      },
+    }
+    let response = await axios.request(config).then(response => {
+      response.data.pipe(fs.createWriteStream('ada_lovelace.jpg'))
+    })
   }
 }