VICTORIA, Texas — The National Association of Shell Marketers (NASM) filed a friend of the court brief in a legal battle taking place in a Victoria County courtroom that could affect the class-action settlement in a swipe fee case involving retailers and Visa Inc. and MasterCard Inc. NASM filed a friend of the court brief, also known as an amicus curiae, in Speedy Stop Food Stores Inc. et al. v. Visa Inc. et al. in the District Court of Victoria County in last week. According to NASM, the case centers around four branded petroleum marketers that opted out of the nationwide Visa-MasterCard class-action settlement in New York. The marketers filed a separate lawsuit against Visa and MasterCard alleging antitrust claims similar to those asserted by the plaintiff class members in the New York class action.