If you wish to manage/extend your just click on the My Notifications option under My Account section.

You will be able to track your Notification Credits so you are directly informed regarding the total usage as well as purchase additional Credits.

The Pay-as-you-go Credits, you have available, are shown in the relative "Additional Pay-as-you-go Credits" section.

Click on the Buy Credits button to get to the "Pay per usage" page where you can select the amount of credits and proceed with the purchase.

Alternatively, you may also consider our Notifications’ Pack.