Vouchers can be used to add money to your account and to add money to your PIN.
Vouchers come in different denominations and can be found at most locations where you would be able to buy activation codes and PINs.

Once you have acquired a voucher, simply go to the login page, login to your account and click on the button “Add Money to My Account.” Enter your voucher number, click submit and your account balance will be adjusted by the amount of the voucher.