Hello,
with Scratch vouchers getting more and more replaced by online recharges (Italy, Portugal) I think, it would be helpful to collect informations, where it possible, to recharge online (best with a credit card).
On the spot, I got:
Caribian, US, Romania:
https://www.ezetop.com/Default.aspx
D:
Aufladen.de - So macht man das!
NL:
Opwaarderen.nl - Prepaid beltegoed opwaarderen doe je bij Opwaarderen.nl !
S:
Tanka mobilen på nätet. Fyll på kontantkortet på Goyada.se
PL:
A-Gadka - Do?adowania telefonów na kart? w Orange Go, Pop, Simplus, Sami Swoi, Tak Tak, Heyah, Play!
To be extended....