For each procedural requirement, the user needs to select the Member State where their evidence is issued. If there are multiple evidences required, the user needs to be able to select the provider Member State for each evidence.

If the portal does not already know what evidence type to request, the procedure portal sends a query to the evidence broker. The evidence broker allows the procedure portal to look up the right evidence type(s) to request from the evidence provider.

To determine who to send the request for evidence to, the portal sends a query to the data service directory (DSD) with the evidence type (provided by the evidence broker) and Member State. The DSD returns the name of the evidence provider and the ID of the eDelivery Access point, or any additional attributes required to locate the evidence provider.

In some cases, Member States may need additional information from the user to determine the right evidence provider (so-called additional attributes). For example, users may be required to input a region or other piece of information to help locate the right provider. Member States must register these attributes in the data service directory (DSD). When defined, the DSD will respond to a query from a portal with a request for these additional attributes. The portal must in turn, request them from the user. The portal will then use the user's input to query the DSD again to define the relevant evidence provider(s).

If the data service directory returns multiple evidence providers for an evidence type, the user will be asked to select the relevant evidence provider from a list. For example, if university diplomas are stored in each university rather than in a central database, the user will be asked to select the right university to request the evidence from.