Prepaid top-ups online

[Schlips1]

Originally Posted by Frank_Costello

Hungary:
etopup.hu

No commission, accept foreign credit cards.

When trying, I get forwarded to my bank to put in the secure code (so this is working), then I get a error message von OTP

"A terhelendő kártya az üzletági követelményeknek nem felel meg."

(Google translate: The card to be charged to the business unit does not meet the requirements.)

Are there other possibilities?