Good point about checking with the bank. Some cards may have restrictions on international or recurring transactions, so confirming everything beforehand can prevent surprises later.
 
I would definitely prioritize stability over convenience here. If a card works consistently and the fees are reasonable, there isn't much reason to keep changing payment methods.
 
Another thing worth checking is whether the card provider has any limits on online or international transactions. Knowing those details before launching a campaign can save a lot of trouble.
 
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