| Module | category | Payment category, user defined grouping of payments |
| Module | destination | Payment destination management implementations. |
| Module | group | Payment groups, a set of payments |
| Module | method | Payment methods |
| Module | operation | Payment operations |
| Module | payment | Payment management implementations. |
| Module | renegotiation | Domain classes for renegotiation management |
| Module | views | No module docstring; 4/6 classes documented |