@startuml

participant User
collections "OrderPayment\nOrderRefund" as P
collections "Order\nOrderPosition" as O
collections "Invoice\nInvoiceLine" as I

User -> O: Order placed (€100)
rnote over O #6DD96D: Order A1B2C\nstatus = **n**\ntotal = €100
O -> P: Payment created
O -> I: Invoice created\n(can also happen later)
rnote over I #6DD96D: Invoice 00001\n€100
rnote over P #6DD96D: OrderPayment A1B2C-P-1\nstate = **created**
P -> User: Payment details (web, email)
User -> P: Payment performed
rnote over P #EFF46B: OrderPayment A1B2C-P-1\nstate = **confirmed**
P -> O: Order marked as paid
rnote over O #EFF46B: Order A1B2C\nstatus = **p**\ntotal = €100
User -> O: Data change (e.g. invoice address)
O -> I: Invoice reissued
rnote over I #6DD96D: Invoice 00002\n€-100
rnote over I #6DD96D: Invoice 00003\n€100
rnote over O #EFF46B: Order A1B2C\nstatus = **p**\ntotal = €100
User -> O: Order canceled
rnote over O #EFF46B: Order A1B2C\nstatus = **c**
O -> I: Invoice canceled
rnote over I #6DD96D: Invoice 00004\n€-100
O -> P: Refund started
rnote over P #6DD96D: OrderRefund\nA1B2C-R-1\nstate = **created**
P -> User: Money sent
rnote over P #EFF46B: OrderRefund\nA1B2C-R-1\nstate = **done**

@enduml