update doc api

@@ -91,5 +91,33 @@ public static class Response {
 }
 ```
 
+##### 4. 小程序领取课程提交接口
 
+- URL: {{localhost}}/boxfish-online-card/order/mini/submitCourseOrder
+- Method: POST
+- RequestBody: 
+
+```json5
+{
+  // 领取人openId
+  "openId": "openId",
+  // 邀请人的邀请码
+  "invitationCode": 100000001,
+  
+  // 领取课程类型：体验课 = 'COURSE_EXPERIENCE'， 单词课 = "COURSE_TEXTBOOK_V2_WORD"
+  "courseType": "COURSE_EXPERIENCE",
+  // 领取的教材版本
+  "versionCode": "versionCode",
+  
+  // 领取人信息
+  "orderName": "orderName",
+  "orderMobile": "orderMobile",
+  
+  // 领取人地址
+  "orderProvince": "orderProvince",
+  "orderCity": "orderCity",
+  "orderCounty": "orderCounty",
+  "orderAddressDetail": "orderAddressDetail"
+}
+```