How to redeem Free Fire Diamonds
1. Login to https://shop2game.com/app
2. Select Free Fire
3. Select a Login option
4. If login with Player ID is selected, input your in-game user ID
5. Select Garena Voucher
6. Enter your code and follow the prompts to activate
Any further additional assistance can be acquired by contacting GArena support at the following link : https://www.garena.sg/support