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. <EOS>