@startuml
skinparam state {
  BackgroundColor<<choice>> LightYellow
}

[*] --> SUBMITTED

state PAID_choice <<choice>>
PAID --> PAID_choice
state SUBMITTED_choice <<choice>>
SUBMITTED --> SUBMITTED_choice

SUBMITTED --> PAID : PAY
PAID --> FULFILLED : FULFILL
SUBMITTED --> CANCELED : CANCEL [lambda]
PAID --> CANCELED : CANCEL
SUBMITTED --> SUBMITTED : ABCD
SUBMITTED_choice --> PAID2 :  [lambda]
SUBMITTED_choice --> PAID3
PAID_choice --> PAID1 :  [lambda]
PAID_choice --> PAID2 :  [lambda]
PAID_choice --> HAPPEN :  [lambda]
PAID_choice --> PAID3
PAID2 --> CANCELED
PAID3 --> CANCELED
PAID1 --> PAID1 : ABCD

PAID1 --> [*]
CANCELED --> [*]
FULFILLED --> [*]
HAPPEN --> [*]
@enduml