Flow 2

flow2

### Flow 2.0
#### Sequence Diagrams
##### When Invoice is transmitted

###### Sequence
```sequence
ScheduleFirstRequestEmailJob->InvoiceEventScheduler: schedule_first_request
Note right of InvoiceEventScheduler: Decide the 1st request date
Note right of InvoiceEventScheduler: Schedule the event without a channel
InvoiceEventScheduler-->ScheduleFirstRequestEmailJob: Ok!
```

###### Flow
```flow
st=>start: When invoice is transmitted!
async=>operation: ScheduleFirstRequestEmailJob.perform_async
schedule_first_request=>operation: Invoice::EventScheduler#schedule_first_request
first_request_date=>operation: Decide the first_request_date based on the message profile
schedule_event=>end: schedule_event without channel

st->async->schedule_first_request->first_request_date->schedule_event
```

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