According to the query of Aiqicha, the reasons why credit card payment cannot be used for Alipay payment may be due to the following reasons:

1. The credit card status is abnormal: the credit card account is frozen, canceled or Restricted use, in this case Alipay cannot complete the payment.

2. Insufficient credit card balance: Insufficient credit card balance or the cumulative consumption limit of the credit card for the day has reached the upper limit, which will also cause Alipay payment to be unable to be completed.

3. Alipay account abnormality: The user's Alipay account is restricted or the account is frozen, which may also cause payment failure.

4. System maintenance: The Alipay system is undergoing maintenance or upgrade. In this case, payment failure may occur.