This service is available to you if your SEN master account is registered in one of the countries listed below:
You can top up your wallet either after you have selected your purchases by selecting [Add Funds] on the Purchase Confirmation screen or you can top up your wallet without making a purchase.
You can reach Account Management in a number of ways:
Tap [PlayStation Store] on the home screen and go to [Online ID] > [Add Wallet Funds].
Go to PlayStation Store. Sign in, go to your Online ID at the top of the page and click [Add Wallet Funds].