For example, I can call
xmlrpclib.ServerProxy('http://localhost:9069/xmlrpc/db').create_database('db_name',False, 'en')
But I would like to add a new method by a module
Thanks for the help!
Odoo is the world's easiest all-in-one management software.
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Have you tried creating a new module with your custom method? Since all the methods should be available, so should yours in that case.