It is a database which stores:
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Serial numbers and hashes of public keys of clients who have activated this serial number (users can authorize with it)
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Serial number expiration dates and dates of the last connection using this serial number (is used for calculating expiration date for every serial number).
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Hashes of conditional transactions for each client. That is, if several clients have authorized with a serial number, each will have its own set of transactions (conditional transactions are necessary for providing advanced VPN service, when client wants to choose service provider by his own, these kind of transactions are tied to the client).
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Order limits which are minimum and maximum allowed number of units in an order, and maximum allowed cost per unit (this is important to avoid some over and low prices in the market, providing fair service).
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User’s reports (we always collect data about all technical problems and user cases to make our service better).
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Node list for clients (these nodes are collected in one list because they will be offered to the client as service providers).
When you buy a serial key, the payment gate provides it for you.