diff --git a/cm_bot.py b/cm_bot.py
index 70130e5..27cf98d 100644
--- a/cm_bot.py
+++ b/cm_bot.py
@@ -432,8 +432,8 @@ class CM_BOT:
             data=transfer_data,
             headers=self.transfer_credit_headers
         )
-        # with open('transfer_credit.html', 'wb') as f:
-        #     f.write(response.content)
+        with open('transfer_credit.html', 'wb') as f:
+            f.write(response.content)
         return True if re.search(r'Successfully saved the record\.', response.text) else False
 
     def get_user_credit(self):
diff --git a/cm_bot_hal.py b/cm_bot_hal.py
index b0493ac..64624fb 100644
--- a/cm_bot_hal.py
+++ b/cm_bot_hal.py
@@ -66,10 +66,11 @@ class CM_BOT_HAL:
         cm_bot = CM_BOT()
         username = self.get_next_username(self.prefix)
         password = self.get_random_password()
-        cm_bot.login(
+        if cm_bot.login(
             username = self.agent_id, 
             password = self.agent_password
-        )
+        ) == False:
+            raise Exception(f'[Cannot login] {self.agent_id} cannot login.')
         cm_bot.register_user(
             user_id = username,
             user_password = password
@@ -77,10 +78,11 @@ class CM_BOT_HAL:
         cm_bot.logout()
 
         cm_bot = CM_BOT()
-        cm_bot.login(
+        if cm_bot.login(
             username = username,
             password = password
-        )
+        ) == False:
+            raise Exception(f'[Cannot login] {username} cannot login.')
         link = cm_bot.get_register_link()
         cm_bot.logout()
 
@@ -133,10 +135,11 @@ class CM_BOT_HAL:
         t_username, f_username = self.get_whatsapp_link_username(whatsapp_link)
         password = self.get_user_pass_from_acc(f_username)
         cm_bot = CM_BOT()
-        cm_bot.login(
+        if cm_bot.login(
             username = f_username,
             password = password
-        )
+        ) == False:
+            raise Exception(f'[Cannot login] {f_username} cannot login.')
         if cm_bot.set_security_pin(self.security_pin) == False:
             cm_bot.logout()
             raise Exception(f'Agent acc: {f_username} already has security pin!')
@@ -159,19 +162,23 @@ class CM_BOT_HAL:
 
     def get_user_credit(self, f_username: str, f_password: str):
         cm_bot = CM_BOT()
-        cm_bot.login(
+        if cm_bot.login(
             username = f_username,
             password = f_password
-        )
+        ) == False:
+            raise Exception(f'[Cannot login] {f_username} cannot login.')
         return float(cm_bot.get_user_credit())
 
     def transfer_credit_api(self, f_username: str, f_password: str, t_username: str, t_password: str):
         cm_bot = CM_BOT()
-        cm_bot.login(
+        if cm_bot.login(
             username = f_username,
             password = f_password
-        )
+        ) == False:
+            raise Exception(f'[Cannot login] {f_username} cannot login.')
         amount = cm_bot.get_user_credit() - 0.01
+        if amount <= 0.01:
+            print(f'[No enough credit] {t_username} do not have enough credit.')
         if cm_bot.transfer_credit(t_username, t_password, amount) == True:
             print(f'Successfully transfer amount: {amount} from {f_username} to {t_username}')
         else: