Abstract: A method for a first user terminal to use a messenger service of a group chat room is proposed. The method may include receiving, from a server, invitation information associated with a second user's inviting a first user to the group chat room, and displaying chat room information on the group chat room. The method may also include in response to the second user not being registered as a friend of the first user in the messenger service, displaying information on the second user and an interface for deciding whether to participate in the group chat room. The method may further include acquiring an interaction regarding a decision to participate in the group chat room through the interface, and displaying a message created in the group chat room.

Abstract: A method and apparatus for a remittance service are disclosed. An operation method of a server providing a remittance service includes receiving, from a remitter participating in an anonymous chatroom by using a first temporary profile, a request for a remittance to a second temporary profile participating in the anonymous chatroom, verifying a remittance qualification of an account of the remitter, generating remittance transaction information for remitting an amount corresponding to the remittance request to an account of a remittee corresponding to the second temporary profile, and transmitting, to the account of the remittee a remittance notification including information on the first temporary profile as remitter information.