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It’s David against Goliath, modern version. José Montet, 58, an independent computer scientist living in Athis-Mons (Essonne) but currently at his mother’s bedside in Martinique, intends to have people recognize that he is the inventor of secure payment. It’s been more than ten years since he started a showdown, alone, against the American giant PayPal, which has made a fortune in online payment, with 426 million active customers and which has a turnover of around 20 billion. dollars depending on the year.