The credit line in a credit card is provided by the bank to the cardholder for consumption, and cannot be used for recharge, transfer, remittance and other purposes. Banks make such regulations mainly to prevent criminals from taking advantage of credit cards to cash out illegally.
I suggest that you can use Alipay-bound credit card for online shopping or express payment.
By the way, if you have a great demand for online shopping, it is recommended to apply for a Taobao credit card from CITIC Bank.