Event Subscription with HTTP Post and Get Only?

In the Developer Programs > Tutorials section of the forum, you can find a sample to create a Simple SmartApp which contains samples of subscriptions:

Note: Remember this SDK is based on the Core SDK, so, in that repo, you can see which functions (requests) you can use. You’ll find them inside each endpoint: https://github.com/SmartThingsCommunity/smartthings-core-sdk/tree/master/src/endpoint
This is important because there are different types of subscriptions as specified in the API reference.