@startuml
!include skin.inc

participant "Application" as app 
participant "Server" as srv 

app -> srv: POST WrtcsNotificationSubscription(callbackURL)
note right of srv: Create a new\nsubscription
srv --> app: Response with subscriptionId in resourceURL
app -> srv: DELETE a subscription with subscriptionId
note right of srv: Delete the \nsubscription
srv --> app: Response

@enduml