@startuml
skinparam NoteTextAlignment left
skinparam Padding 2
skinparam ParticipantPadding 50
skinparam LifelineStrategy solid

participant "FHIR Server" as S
participant Subscriber    as C

group Normal Operation
  ...
  S -> C: Notification ""Bundle""\n""type: **event-notification**""\n""eventsSinceSubscriptionStart:  **21**""\n""notificationEvent.eventNumber: **21**""\n
  return ""200: OK""
  ...
  S -> C: Notification ""Bundle""\n""type: **event-notification**""\n""eventsSinceSubscriptionStart:  **23**""\n""notificationEvent.eventNumber: **23**""\n
  return ""200: OK""
  ...
end

note left of C
  Subscriber determines event **22** is missing
end note

group Subscriber Recovery Process
  ...
  C <-> S: FHIR API calls...
  ...
end

group Re-enable Subscription
  C -> S:Update Subscription\n""status: requested""
  return ""200: OK""
  ...
end

group Resume Normal Operation
  S -> C: Notification ""Bundle""\n""type: **event-notification**""\n""eventsSinceSubscriptionStart:  **24**""\n""notificationEvent.eventNumber: **24**""\n
  return ""200: OK""
  ...
end
@enduml