This can be done via your Business Dashboard under Campaigns which comes under the Marketing tab.
Follow the steps given below -
1. Click on 'campaigns' under the marketing tab. On the header, you will see a button which will show you your wallet balance.
2. Click on the button. It will take you to your transaction history as shown below.
If you click on 'add balance', you will be given a breakup of costs for an email and SMS campaign, along with an option to add an amount.
4. You will then be redirected to a payment gateway page, where you will need to input your details for the amount to be credited.
