tsk-10: View scheduled messages (#17)

Closes #10

Reviewed-on: phoenix/textsender#17

src/api/scheduleApi.js

@@ -20,6 +20,25 @@ export const scheduleApi = {
     }
   },
 
+  getScheduledMessage: async (userId, authBearerToken) => {
+    const response = await fetch(
+      `${API_BASE_URL}/api/v1/schedule/message?user_id=${userId}`,
+      {
+        method: 'GET',
+        headers: {
+          'Content-Type': 'application/json',
+          Authorization: authBearerToken,
+        },
+      }
+    );
+
+    if (!response.ok) {
+      throw new Error('Error getting scheduled message');
+    } else {
+      return response.json();
+    }
+  },
+
   prepareMessage: async (reqBody, authBearerToken) => {
     console.log('Preparing Scheduled message');