we don't have dedicated server.  we are using shared server. Now I want to develop an app for oddo where i need to store some data in database. How can I get access to database to store some data? 

And From ssh tunnel I can access psql but this is not what i want, I want to get api connection of oddo psql database.

Direct access is supported only on a dedicated Server.

For shared Servers you can create an SSH tunnel.