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@startuml
scale 1.2

Client -> "Credentials Service"++: transfer(subject: "get", body: search criteria)
note right of Client
search criteria is a JSON
object that contains
type and auth-id
end note

note over "Credentials Service"
lookup credentials
end note

"Credentials Service" -> Client- -: transfer(status: "200", body: credentials)
@enduml

PlantUML version 1.2019.07beta1(Unknown compile time)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Java Version: 1.7.0_25-b15
Operating System: Linux
Default Encoding: UTF-8
Language: en
Country: US
--></g></svg>