2 use cases: 2 still miss something, and 0 things on the map have no use case.
| Use case | Concept Logical payment | Concept Order | Concept Processor confirmation | Concept Refund |
|---|---|---|---|---|
| Refund the unavailable lamp 1 missing | R | T | W | W |
| Covered by | 1 | 1 | 1 | 1 |
W Writes to it or sends it work R Reads from it T Passes a part it lives in