Re: credit cards
While we use American Express for most of our cards, we do have a small Visa program. There are no fees incurred and it is compatible with Concur - there is no minimum spend. The program is with Elan - which is actually a subsidiary of US Bank. You could reach out to them and see if they can accommodate your needs. You should, however, remember that although the credit card program may not charge you any fees (or low fees), there will likely be a charge from Concur for setting up a new data feed. You should speak with your Concur rep.
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Anaren, Inc. - Travel Manager - Syracuse, NY