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MainStream Merchant Services™ is a leading provider of merchant payment processing solutions. Our customers represent a diverse array of organizations in the restaurant, retail, lodging, petroleum and other industries, all with unique credit card processing needs. Our mission is simple: to provide our customers with the best merchant payment processing products and services available to grow their revenue and meet their business goals, at the lowest rates. 

MainStream provides a wide array of debit and credit card processing solutions, offering the best in custom gift card programs, POS terminals and credit card terminals, Web and PC credit card processing solutions and check conversion and guarantee services.  All of MainStream’s products and services come with sophisticated online reporting, the latest in data security and top-notch, 24/7 customer support.
MainStream is an independent sales organization (ISO) of First Data, the world’s largest provider of merchant payment processing services.  By leveraging First Data’s extensive array of products and services – as well as back end support – we are able to offer our customers unparalleled service, security and accountability.
 
 
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Mainstream Merchant Services Inc. is a registered ISO/MSP of Wells Fargo Bank, N.A., Walnut Creek, CA