TSYS Merchant Solutions (tsysmerchantsolutions.com) is a publicly traded direct credit card processor. See TSYS reviews and ratings from real users here.

American Express Merchant Services is the credit card processing branch of American Express. See American Express reviews and ratings from real users here.

Integrity Payment Systems (integritypays.com) is a merchant account provider. See Integrity Payment Systems reviews and ratings from real users here.

Elavon (elavon.com) is one of the largest credit card processing companies in the United States. See Elavon reviews and ratings from real users here.

Mercury Payment Systems (mercurypay.com) is now Vantiv Integrated Payments. See Mercury Payment Systems reviews and ratings from real users here.