A method for service implementation, the method comprising: binding a biometric feature identifier of a biometric feature of a user to a user account of the user on a server, wherein the biometric feature of the user has been verified at a first terminal device, wherein the user is an authorized user currently logged-in at the user account, and wherein the user enables using a biometric identifier instead of the user account to complete a related service at a second client; after a display instruction of a graphic code is received at a first client, obtaining (S101, S401), by the first client, a first biometric feature identifier of the biometric feature of a first user, wherein the biometric feature has been verified by the first terminal device; generating (S102, S401), at the first client, a code string that carries the first biometric feature identifier; adding, by the first client, the code string to the graphic code instead of a first user account of the first user for completing the related service at the server; and displaying (S103, S204, S 403) the graphic code that carries the code string at the first client, so after scanning the graphic code by a second client terminal device, the second client terminal device sends the code string to the server, and the server identifies the first user account for the first user based on searching for the bound user account to the first biometric feature identifier carried with the graphic code to complete the related service, wherein the first biometric feature identifier comprises the biometric feature identifier of the biometric feature of the user verified at the first terminal device in advance, and the first user account comprises the user account bound to the biometric feature identifier. binding a biometric feature identifier of a biometric feature of a user to a user account of the user on a server, wherein the biometric feature of the user has been verified at a first terminal device, wherein the user is an authorized user currently logged-in at the user account, and wherein the user enables using a biometric identifier instead of the user account to complete a related service at a second client; after a display instruction of a graphic code is received at a first client, obtaining (S101, S401), by the first client, a first biometric feature identifier of the biometric feature of a first user, wherein the biometric feature has been verified by the first terminal device; generating (S102, S401), at the first client, a code string that carries the first biometric feature identifier; adding, by the first client, the code string to the graphic code instead of a first user account of the first user for completing the related service at the server; and displaying (S103, S204, S 403) the graphic code that carries the code string at the first client, so after scanning the graphic code by a second client terminal device, the second client terminal device sends the code string to the server, and the server identifies the first user account for the first user based on searching for the bound user account to the first biometric feature identifier carried with the graphic code to complete the related service, wherein the first biometric feature identifier comprises the biometric feature identifier of the biometric feature of the user verified at the first terminal device in advance, and the first user account comprises the user account bound to the biometric feature identifier.