What is the security concern of e-payment method on online music provider?
when the payment provider adheres to PCI standards you need not worry. If you meant this question as a consumer then
you can use online only credit cards whose credit limit is adjustable by you. Like you can keep as low as $1 .
such cards are provided by banks in many country.
I have seen in my country. Also subscribe for verified by visa.
some central banks mandate that. Dont use physical keyboards.
some antivirus companies like kaspersky gives you virtual keyboards. usually many banks's online payment gateways enforces virtual keyboards,verified by visa etc .