diff --git a/src/api.ts b/src/api.ts
index b9057d7..bd69a1a 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -40,9 +40,9 @@ class ApiClient {
         return response.data;
     }
     
-    async post<T>(url: string, data: any, includeToken = true): Promise<T> {
+    async post<T>(url: string, data: any, params?: URLSearchParams, includeToken = true): Promise<T> {
         const headers = this.getHeaders(includeToken);
-        const response = await this.client.post<T>(url, data, { headers });
+        const response = await this.client.post<T>(url, data, { headers, params });
         return response.data;
     }
 }
diff --git a/src/service/TaskService.ts b/src/service/TaskService.ts
index d1c422c..8c94d7f 100644
--- a/src/service/TaskService.ts
+++ b/src/service/TaskService.ts
@@ -7,8 +7,10 @@ class TaskService extends _ServiceBase {
         return await api.get<TaskListResponse>('/task');
     }
 
-    async completeTask(taskId: string) {
-        return await api.post<void>(`/task/${taskId}/complete`, {})
+    async completeTask(taskId: string, childId: string) {
+        const params = new URLSearchParams();
+        params.append('childId', childId);
+        return await api.post<void>(`/task/${taskId}/complete`, {}, params);
     }
 }