I work at an organization that uses concur. My team work at the other end of the process. They take Concur outputs and pay the claimants back. We find that somehow makes us the support department, adding users, training them, and worse still teaching them how to get around rejections. It is a bit less work for us than the paper forms I started my career with. It does rather push the overhead of claiming the expense onto the claimers though, many of which tend to be those whose time is most expensive. I'm not sure it works out.