@startuml

scale 3.0

Object "<u>:Cashier" as C
Object "<u>:Register" as R
Object "<u>s:Sale" as S
Object "<u>:Payment" as P

Object "<u>:Store" as Store
Object "<u>completedSale:Sale" as completedSale  <<collection>> #lightblue


C -right- R : > makePayment(cashTendered)

R -right- S : > 1: makePayment(cashTendered)
S -down- P : > 1.1: create(cashTendered)

R -down- Store : > 2: addSale(s)
Store -down- completedSale : > 2.1: add(s)

@enduml