BATTLE.NET ACCOUNT BALANCE CREDIT CARD
You can buy items in Heroes of the Storm using your credit card, and doing so is very easy.
Step 1: Step 1 : Add your credit information in Battle.net.
Click on “Load Balance”
Click “Add Balance” , then "Add default payment method" , then "Add payment method"
Step 2: Choose your credit card type.
Step 3: Fill in credit card information, click Save Payment Method.
Step 4: If you followed every step correctly, you will see in green text “Payment Method Added”. You can now enter the game and use your credit card to buy items!
Once you’re in the game, select the in-game item you wish to buy.
Select your preferred credit card.
Type your Battle.net password again then click Pay Now.
If your purchase is complete, it’ll look like this.