The Core API can be used to request real-time data such as availability, rates, inventory and supplements from OpenGDS.
Creating, updating and canceling reservations is also done through the Core API.
The Promocode API can be used to make OpenGDS interact with your own voucher database.
If your company relies on (promo)codes for guests to create reservations, this is the way to go.
Promocodes can be used as: vouchers, giftcards, campaign codes, discount codes, access codes etc.
The Push API can be used to make OpenGDS push availability, rates and inventory to your own servers.
With the Push API you can keep your own backend up-to-date, and serve requests from your own database.
The Channel Manager API can be used by Channel Managers and Property Management Systems to connect with OpenGDS.