See the API's various operations for details on their request parameters and response data:

OperationMethodEndpoint
Activations
List activationsGET/activations
Activate a key collection versionPOST/activations
Key collections
List key collectionsGET/key-collections
Create a key collectionPOST/key-collections
View a key collectionGET/key-collections/​{collectionId}
Versions
Create a key collection versionPOST/key-collections/​{collectionId}/​versions
View a key collection versionGET/key-collections/​{collectionId}/​versions/​{versionId}