@startuml
' Style the entity (see https://github.com/plantuml/plantuml-stdlib/blob/master/material/door.puml)
hide <<MA DOOR>> stereotype
hide <<MA DOMAIN>> stereotype
<style>
.MA DOOR {
    BackgroundColor LightGreen
}
</style>

actor Bob #red
!include <material/common>
!include <material/door>
!include <material/domain>
' the following macro generates an entity of type participant and doesn't have {} at the end
' see https://github.com/plantuml/plantuml-stdlib/blob/master/material/door.puml for how the macro is defined
MA_DOOR(Purple, 1, setup_public_key, participant, "Public key")
MA_DOMAIN(Blue, 1, domain, participant, "domain")

' optionally use the $ma_door sprite inside a participant (or actor)
participant "<color:blue><$ma_door{scale=1}>\nDoor" as door

Bob -> setup_public_key : open
Bob -> door : open
Bob -> domain : react
@enduml