An example of the use of this functionality can be found on the well-known site За рулем.рф:

When you go to the product catalog, a redirection to the Agora portal will be carried out, which may have a similar site or a typical interface:

The configuration and operation logic is as follows:

• When setting up, the supplier must upload information about customers with tokens to Agora (a unique token is issued to each customer on the supplier’s website).
• When switching from the supplier’s site to the Agora portal, a client token is requested.
• The Agora system checks tokens from the list of clients and the token that goes to the client portal, if the tokens match, it authorizes the client on the Agora portal.