Method and device for linking to account and providing service process

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• transmitting, by a certified server to an uncertified server, a license certificate that authorizes the uncertified server to perform service interaction with the certified server;
• receiving, by the uncertified server, a linking request sent by a terminal device, wherein the linking request corresponds to a user account logged in by a user to the uncertified server;
• obtaining, by the uncertified server, a signed license certificate based on signing the license certificate that is authorized by the certified server to the uncertified server;
• transmitting, from the uncertified server to the terminal device, a predetermined instruction including the signed license certificate based on the linking request, wherein the predetermined instruction instructs the terminal device to send a real service account request including the signed license certificate and a real service account to the certified server based on predetermined instruction;
• verifying, by the certified server, the signed license certificate;
• in response to verifying the signed license certificate, generating, by the certified server, a virtual service account identifier for the user based on a terminal device parameter and the real service account or based on a time and the real service account;
• transmitting, by the certified server, the virtual service account identifier to the terminal device;
• receiving, by the uncertified server from the terminal device, the virtual service account identifier generated by the certified server in response to the real service account request sent by the terminal device to the certified server;
• linking, by the uncertified server, the received virtual service account identifier to the user account registered by the user at the uncertified server;
• locally storing, by the uncertified server, a linking relationship between the registered user account and the virtual service account identifier of the user;
• receiving, at the uncertified server from the terminal device, a service request corresponding to the user account;
• identifying, by the uncertified server, the virtual service account identifier linked to the user account based on the locally stored linking relationship between the user account and the virtual service account identifier;
• transmitting, by the uncertified server, the virtual service account identifier and the service request to the certified server associated with the service request;
• determining, by the certified server, the real service account corresponding to the virtual service account identifier;
• performing, by the certified server, service processing based on the real service account and the service request;
• receiving, by the uncertified server, a service processing result associated with the service request from the certified server;
• and
• transmitting, by the uncertified server, the service processing result to the terminal device.