Create Dropbox application
1. Goto https://www.dropbox.com/developers , and click 'Sign In' on the top right.
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2. Sign In with your credentials or Sign Up
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5. Choose the type of access you need
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6. Fill in name of your application, check terms checkbox, and click 'Create app'
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7. Add https://oauth.io/auth to Redirect URIs
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8. Find your App key an App secret
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