Really, off of debit transactions? I thought interchange is only 0.05% + $0.21, which doesn't seem like enough to power rewards ever. These days I thought it's only credit cards that can support rewards (closer to 2% interchange).
E.g for an employee to spend up to $5,000 on a trip, would the company have to preload $5K onto the card? Or alternatively would employees have to get approval for each expense in advance of spending it?