Typical reasons for payment refusal and what to do if your payment fails
In the AliExpress case, it's especially important to check three things before the first payment attempt. First, the regional restrictions of the service itself. Second, the currency in which the charge or test authorization will occur. Third, the payment scenario must match the merchant's anti-fraud practices.
Chaotic repeated attempts often do more harm than good. If the first payment is rejected, it's more useful to stop and check: are there sufficient funds, taking into account a possible test block, is there a limit, and is the rejection related to an invalid currency or an unsupported MCC? This disciplined approach is almost always better than a series of impulsive attempts "just in case it works the second time."