@startuml
left to right direction
skinparam packageStyle rectangle
actor :Anbieter: as anb
actor :Nachfrager: as nach
actor :Angestellter: as ang

rectangle "Standfläche Mieten" {
    anb -- (Anmeldung)
    nach -- (Anmeldung)
    (Anmeldung) -- ang
  (checkout) .> (payment) : include
  (help) .> (Anmeldung) : extends
}
@enduml