You can purchase Razer Gold to then purchase Steam Wallet vouchers which can be used to top up your Steam Account
Do note that you have to buy the correct corresponding vouchers for the wallet currency you want to top up
Your Steam Wallet currency is SGD, you have to purchase Steam Wallet SGD to top up your Steam Wallet
Razer Gold is completely safe to use.
Razer Gold is an authorised platform that has been approved by the game developers to distribute in-game currencies to your game accounts.