Method for processing a payment transaction, the method being implemented by an autonomous electronic device for the processing of payment transactions, called a payment kiosk, said payment kiosk comprising a processor (Prc) connected to at least one rendering means (Src) for rendering sales offers, and linked to at least one communications interface (Cl) and to at least one contactless payment terminal (TPNfc), said method comprising: - a step for the transmission, by a browser (Nav) installed within said payment kiosk, of a request for obtaining contents (RqOC) made to a contents server (SrvCnt); - a step for the reception, by said browser (Nav), coming from the contents server (SrvCnt), of an HTML content (HCnt) representative of at least one sales offer, said HTML content comprising one payment tag (HPElt) per sales offer included in said HTML content (HCnt); - a step for processing said HTML content (HCnt), delivering a view (Aff) of said HTML content (HCnt) on said at least one rendering means (Scr); said method being characterized in that it further comprises a step for the initialization, prior to any interaction of a user with said payment kiosk in order to respond to one of said at least one sales offer, of at least one payment transaction (PT#), each of said at least one payment transaction being associated with one of said at least one sales offer included in said html content (HCnt), the number of initialized payment transactions being a function of the number of payment terminals installed in said payment kiosk and the number of payment tags (HPElt) present in said html content (HCnt), said initialization step comprising, for each of said at least one payment transaction, the configuration of a different one of said payment terminals for the implementation of said payment transaction, as a function of data attributes of the payment tag (HPElt) of the sales offer associated with said payment transaction, the configuration of a payment terminal comprising: - obtaining, from said data attributes of the payment tag of the sales offer associated with said payment transaction, offer parameters comprising a date, an amount, a currency, a duration, and banking parameters of a merchant; - opening a transaction associated with said offer parameters by means of said payment terminal; - positioning said payment terminal in a state of waiting for a payment relating to said opened transaction, said waiting state being maintained only for a predetermined duration of display of the sales offer on said at least one rendering means, said opened transaction being cancelled if no payment is made during said predetermined duration. - a step for the transmission, by a browser (Nav) installed within said payment kiosk, of a request for obtaining contents (RqOC) made to a contents server (SrvCnt); - a step for the reception, by said browser (Nav), coming from the contents server (SrvCnt), of an HTML content (HCnt) representative of at least one sales offer, said HTML content comprising one payment tag (HPElt) per sales offer included in said HTML content (HCnt); - a step for processing said HTML content (HCnt), delivering a view (Aff) of said HTML content (HCnt) on said at least one rendering means (Scr); said method being characterized in that it further comprises a step for the initialization, prior to any interaction of a user with said payment kiosk in order to respond to one of said at least one sales offer, of at least one payment transaction (PT#), each of said at least one payment transaction being associated with one of said at least one sales offer included in said html content (HCnt), the number of initialized payment transactions being a function of the number of payment terminals installed in said payment kiosk and the number of payment tags (HPElt) present in said html content (HCnt), said initialization step comprising, for each of said at least one payment transaction, the configuration of a different one of said payment terminals for the implementation of said payment transaction, as a function of data attributes of the payment tag (HPElt) of the sales offer associated with said payment transaction, the configuration of a payment terminal comprising: - obtaining, from said data attributes of the payment tag of the sales offer associated with said payment transaction, offer parameters comprising a date, an amount, a currency, a duration, and banking parameters of a merchant; - opening a transaction associated with said offer parameters by means of said payment terminal; - positioning said payment terminal in a state of waiting for a payment relating to said opened transaction, said waiting state being maintained only for a predetermined duration of display of the sales offer on said at least one rendering means, said opened transaction being cancelled if no payment is made during said predetermined duration. - obtaining, from said data attributes of the payment tag of the sales offer associated with said payment transaction, offer parameters comprising a date, an amount, a currency, a duration, and banking parameters of a merchant; - opening a transaction associated with said offer parameters by means of said payment terminal; - positioning said payment terminal in a state of waiting for a payment relating to said opened transaction, said waiting state being maintained only for a predetermined duration of display of the sales offer on said at least one rendering means, said opened transaction being cancelled if no payment is made during said predetermined duration.