PARIS — The French retailer Carrefour Group has issued 2.5 million contactless cards since kicking off nine months ago what has become one of Europe's most-watched payments projects.

Frederic Marzurier, the administrative and financial director of the company's financial services subsidiary Societe des Paiements, said that 38% of Carrefour customers who have made purchases of less than $37 have done so using the cards' contactless capabilities.

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