Method for remote payment, from a user device, for a shopping cart on an e-commerce server, said user device being able to connect to a mobile telephony network and associated with an identification number in said mobile telephony network, wherein a) the user device selects a method of payment for the shopping cart on a first page of the e-commerce server; b) on selection of the payment method, the user device sends a payment request to a payment validation module, the payment request requesting a page displaying payment transaction data, said request being automatically enriched with identification data of the user device from which the identification number of said user device in the mobile telephony network is determined, c) the user device receives a local authentication request message from the payment validation module, addressed to the identification number of the device in the mobile telephony network, through the mobile telephony network, said request message comprising payment transaction data, d) following the reception of the local authentication request message, the user device automatically triggers the execution of an operation of local authentication of a user of the user device, during which, the user device comprising a security module memorising a service code, the device displays a window for inputting the service code containing said transaction data, the user inputs said service code, the security module checks the input service code and, if it is valid, generates a response message indicating that the authentication has succeeded and comprising said transaction data, the response message being encrypted to the payment validation module, e) the user device sends said response message to the payment validation module, f) the user device is redirected by the payment validation module to a second page of the e-commerce server indicating the result of the payment transaction by the reception, from the payment validation module, of a response to said payment request, indicating that the requested page has moved and is accessible to the e-commerce server at an address pointing to the second page, the response comprising the transaction data encrypted by the payment validation module and intended for the e-commerce server, g) the user device transmits a request to obtain the second page to the e-commerce server, said request comprising said encrypted transaction data intended for the e-commerce server. a) the user device selects a method of payment for the shopping cart on a first page of the e-commerce server; b) on selection of the payment method, the user device sends a payment request to a payment validation module, the payment request requesting a page displaying payment transaction data, said request being automatically enriched with identification data of the user device from which the identification number of said user device in the mobile telephony network is determined, c) the user device receives a local authentication request message from the payment validation module, addressed to the identification number of the device in the mobile telephony network, through the mobile telephony network, said request message comprising payment transaction data, d) following the reception of the local authentication request message, the user device automatically triggers the execution of an operation of local authentication of a user of the user device, during which, the user device comprising a security module memorising a service code, the device displays a window for inputting the service code containing said transaction data, the user inputs said service code, the security module checks the input service code and, if it is valid, generates a response message indicating that the authentication has succeeded and comprising said transaction data, the response message being encrypted to the payment validation module, e) the user device sends said response message to the payment validation module, f) the user device is redirected by the payment validation module to a second page of the e-commerce server indicating the result of the payment transaction by the reception, from the payment validation module, of a response to said payment request, indicating that the requested page has moved and is accessible to the e-commerce server at an address pointing to the second page, the response comprising the transaction data encrypted by the payment validation module and intended for the e-commerce server, g) the user device transmits a request to obtain the second page to the e-commerce server, said request comprising said encrypted transaction data intended for the e-commerce server.