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Use Case Amount Reservation

+---------------+ +------------------+
| Event Handler | | Charging Handler |
+---------------+ +------------------+
| |
| Amount Reservation Request |
|---------------------------------------------->|
| |
| |
| Amount Reservation Response |
|<----------------------------------------------|
| |

Reservation of amounts of money (or of non-monetary units)
Reserved amounts are then captured at a later point of time.
PPT Version