Must I go through Vickers to buy REITS or can I buy it directly from CPD online?

To buy REITs or any other counter listed on SGX, you will need to go through a broker like DBS Vickers.

The shares will be deposited in your CDP provided your account with the broker is a non-custodian one.

As what Jonathan shared, you'll need to go through a broker to buy any stocks/REITs/bonds from the market.

CDP is just a place for you to store your stocks/REITs/bonds under your name. DBS Vickers is the medium by which you buy/sell your investments.

Long story short, use Vickers to buy REITs. The REITs will then be automatically transferred to your CDP to be stored under your name.