(14)Payment instruments covered by the limited network exclusion could include store cards, fuel cards, membership cards, public transport cards, parking ticketing, meal vouchers or vouchers for specific services, which are sometimes subject to a specific tax or labour legal framework designed to promote the use of such instruments to meet the objectives laid down in social legislation. Where such a specific-purpose instrument develops into a general-purpose instrument, the exclusion from the scope of this Directive should no longer apply. Instruments which can be used for purchases in stores of listed merchants should not be excluded from the scope of this Directive as such instruments are typically designed for a network of service providers which is continuously growing. The limited network exclusion should apply in combination with the obligation of potential payment service providers to notify activities falling within its scope.