We are seeing a large number of Payment Sites, especially in Asia and Europe obscuring the true referrers. We currently manage these by adding them to the list of Internal URL filters, but the list is growing, and it would be really helpful if Adobe were to start building and maintaining such a global list, similarly to the list of Social sites and Search engines.
Alternatively, these payment sites can simply be excluded through "contains" filter (e.g. exclude URLs containing 'bank' or 'card'), but the current list of Internal URL filter currently requires an exact match.
Understanding that some companies may, indeed, want to keep these referring domains, this feature should probably be with an on/off switch per report suite.