Method, carried out by a network node, hereinafter referred to as "discovery server", for participating in at least one of provisioning and controlling operator profiles in terminals, each terminal comprising an integrated circuit card identified by an integrated circuit card identifier, the method being characterized by comprising: storing, or being provided access to, a plurality of associations, the plurality of associations being hereinafter collectively referred to as "authorization table", each association comprising: an integrated circuit card identifier; a service provider identifier for identifying a service provider in charge of a terminal comprising an integrated circuit card identified by the integrated circuit card identifier; and, for each of at least one operator authorized to handle profiles of the integrated circuit card, an operator identifier; receiving, from another network node, hereinafter referred to as "data preparation node", a request, hereinafter referred to as "event registration request", comprising: an integrated circuit card identifier; a service provider identifier; an operator identifier; and a data preparation node identifier for identifying the data preparation node; determining that the received integrated circuit card identifier, service provider identifier, and operator identifier are associated with one another in the authorization table; and registering an event record comprising the received integrated circuit card identifier, service provider identifier, and data preparation node identifier. storing, or being provided access to, a plurality of associations, the plurality of associations being hereinafter collectively referred to as "authorization table", each association comprising: an integrated circuit card identifier; a service provider identifier for identifying a service provider in charge of a terminal comprising an integrated circuit card identified by the integrated circuit card identifier; and, for each of at least one operator authorized to handle profiles of the integrated circuit card, an operator identifier; an integrated circuit card identifier; a service provider identifier for identifying a service provider in charge of a terminal comprising an integrated circuit card identified by the integrated circuit card identifier; and, for each of at least one operator authorized to handle profiles of the integrated circuit card, an operator identifier; receiving, from another network node, hereinafter referred to as "data preparation node", a request, hereinafter referred to as "event registration request", comprising: an integrated circuit card identifier; a service provider identifier; an operator identifier; and a data preparation node identifier for identifying the data preparation node; an integrated circuit card identifier; a service provider identifier; an operator identifier; and a data preparation node identifier for identifying the data preparation node; determining that the received integrated circuit card identifier, service provider identifier, and operator identifier are associated with one another in the authorization table; and registering an event record comprising the received integrated circuit card identifier, service provider identifier, and data preparation node identifier.