[chimeracoder]

> This sounds more like a problem with the issuing banks.

It's a problem with both parties, since both are known to refuse to process them.

> Is there any way for a merchant to know that a card is prepaid?

Yes

> Is there any way for a merchant to know that a card is prepaid?

No

[chimeracoder]

Copy and pasted wrong - just noticed. The 'no' is supposed to be in response to the debit card fees question.