If you have received a promotional code with a discount for your next top-up, you only need to add it in the order summary before the payment is made. 

1. Select your top-up
2. In the Order summary click on Add promo code.
3. Enter your promo code in the blank space and click on Apply in order to redeem it.

 That's all! You will see your discount added on the Summary.

Please note:

• You cannot redeem a promo code that has already been used.
• If you wish to redeem a promo code, it must be applied before you proceed to payment.