Generally speaking, CCB credit cards will receive text messages when they repay online through the bank's channels. If there is no SMS, it may be that your mobile phone number changed but you didn't contact the bank to change it in time, or it may be that the communication network at that time was not good enough to cause you to receive SMS.

As for the transaction SMS, if the SMS reminder service for small transactions is opened, SMS reminders will be sent regardless of the transaction amount. If it is not enabled, the bank will send SMS by default to remind you of large transactions, and all domestic transactions with a single transaction amount of more than 500 will send SMS.

Depends on your situation. If you haven't received the short message and it happens many times in a row, you'd better call the credit card customer service hotline to inquire.