Two new no-annual-fee credit cards for small businesses will be available from U.S. Bank this summer when the issuer takes control of a co-brand partnership with Amazon. The cards will operate on the Mastercard network. American Express has been Amazon’s commercial card partner for the last eight years. Amex has informed its co-brand Amazon cardholders that the conversion to U.S. Bank will occur in August. That conversion will include the sale of outstanding receivables to U.S. Bank. Mastercard and U.S. Bank are working to create new reward opportunities for small business owners. One ...