Method for the authentication of a first person represented at a collection point by a second person so as to authorise said second person to collect a product and/or a service previously selected by said first person, said first person being provided with a communication terminal on which a software module dedicated to the authentication of said first person is installed, said communication terminal being capable of communicating with a personal authentication device via wireless communication means, said method implemented by computer means comprising during a collection phase the following steps: - an acquisition step during which an alias type public identifier, previously communicated by the first person, is entered by the second person on a human/machine interface of the collection point, then is relayed to a central server connected to said interface, - a transmission step during which said central server transmits said entered public identifier and an identification address of said central service, or first address, towards a remote routing server connected to a database, said database comprising a predetermined association link between said public identifier and an identification address of said communication terminal, or second address, - a routing step during which the routing server transmits, according to the second address associated with said public identifier, the first address to said communication terminal, then the software module establishes a direct access path between the central server and said communication terminal, - a query step during which the central server sends via said access path an authentication request towards said communication terminal, and - following a reading by said personal authentication device of a biometric signature (E_BIO), characteristic of said first person, an authentication step during which said read signature (E_BIO) is compared to a reference biometric signature (S_BIO) recorded on the personal authentication device, to authorise the collection of the product and/or service by said second person. - an acquisition step during which an alias type public identifier, previously communicated by the first person, is entered by the second person on a human/machine interface of the collection point, then is relayed to a central server connected to said interface, - a transmission step during which said central server transmits said entered public identifier and an identification address of said central service, or first address, towards a remote routing server connected to a database, said database comprising a predetermined association link between said public identifier and an identification address of said communication terminal, or second address, - a routing step during which the routing server transmits, according to the second address associated with said public identifier, the first address to said communication terminal, then the software module establishes a direct access path between the central server and said communication terminal, - a query step during which the central server sends via said access path an authentication request towards said communication terminal, and - following a reading by said personal authentication device of a biometric signature (E_BIO), characteristic of said first person, an authentication step during which said read signature (E_BIO) is compared to a reference biometric signature (S_BIO) recorded on the personal authentication device, to authorise the collection of the product and/or service by said second person.