A server system may, in a case where first identification information for identifying a first apparatus is inputted to a first terminal device, receive the first identification information from the first terminal device, in a case where the first identification information is received from the first terminal device, store the first identification information in a first memory, after the first identification information has been stored in the first memory, receive second identification information for identifying a second apparatus from the second apparatus, in a case where it is determined that the second identification information is identical to the first identification information due to the second apparatus being identical to the first apparatus, register service information in a specific memory, the service information including information for a user of the first apparatus identified by the first identification information to receive provision of the specific service from the server system.