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Hello!
My be you meant Jot Server but not Jot messenger, because Jot Messenger it is UNA module and can not work separately.
Jot server can be installed on any server meets to its requirements, you just need to open port for connect, use this description for installation.
About OAuth2 it is also Una module: You may read details here https://github.com/unaio/una/wiki/Dev-API