By extension, then, the Visa and MasterCard rules have applied to both Amex and Discover.

FORBES: Credit Card Changes Looming: Merchants Will Be Allowed to Add Surcharges

The deals with Mastercard and Visa represent an extension of a partnership Foursquare has had since 2011 with American Express.

FORBES: Foursquare Inches Toward Profitability With Visa, MasterCard Deals