How to retrieve your User ID and Zone ID:
Open Mobile Legends on your device;
Tap your avatar/profile picture in the top left corner;
Your User ID and Zone ID are shown under your name in the format:
12345678(1234), the number in parentheses is the Zone ID.
How to redeem:
Open the Mobile Legends top up page;
Choose the diamond package;
Select a payment method;
Enter your User ID and Zone ID;
Complete the payment;
Wait for the diamonds to appear in your account;
If missing, restart the game to refresh your balance.