Torch Economy is a collection of economy plugins for the Torch API that provides an extra layer of gameplay for Space Engineers. It is based heavily on (and makes use of) Frontier Economy's code, expanding and modifying it to make it a server-side only modification.
If you'd like to use MYSQL as the ADo.net data provider, it will require some setup.
Send requests to DS using the normal APIGateway (the Protobuf classes are under TorchEconomy/Messages). Messages from other mods should include the TransactionKey if ForceTransactionCheck is enabled in Torch Economy. Responses from Torch will be returned specifically to the client that requested them.
It is currently possibly to interact directly with accounts using the API if properly authorized by the server's TransactionKey.