It's simple! Follow the below steps to reload your PIN to your TNG's balance:
STEP 1: Purchase voucher on Alipay+ Rewards. Launch your Touch 'n Go eWallet app and tap "+ Reload".
STEP 2: Tap on "eWallet Balance".
STEP 3: Tap on "Reload PIN".
STEP 4: "Enter the 10-digit Touch 'n Go eWallet Reload PIN and tap "Reload Now".