Card payments are processed on a secure page of the payment provider: the card details are entered there and never reach our servers. See the online payment security policy for details.
Online payments are credited automatically as soon as the transaction is confirmed; invoice payments are credited once the funds arrive. Keep the payment reference - if the top-up is not reflected on your balance, send it to info@alphasms.net and we will trace the payment.
A full description of the available options is on the payment methods page.