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Bhuvanesh MohankumarBhuvanesh Mohankumar 

Rest Api creation in TrailHead account

I know, that there are multiple questions following, everything is related to REST API creation and consumption, so I added all in one place.

Can I create a new Rest API using my TrailHead account?
Is this API created can be exposed to the external world, means can this be tested in any POSTMAN API test tool?
I have to use this Rest API service in my IOS native mobile application, is that possible.
I am not sure where can I get the OAuth token to access this API if created successfully.