Create Tumblr application

1. Goto Tumblr API page , click on the register an application link.

2. Sing in or Sign Up

3. Click Register application again'

4. Input all information about your application. Set https://oauth.io/auth as a Default callback URL

5. My congratulations, you've successfully created your first Tumblr application. Now you can find its Customer and Secret keys in your apps list.