Create Snapchat application
1. Goto https://kit.snapchat.com/portal/, and Sign In or Sign Up to SnapChat.
2. If you have just signed up, add your email in the Snapchat application.
3. Create your first Application.
4. Edit your Application info and don't forget to add https://oauth.io/auth as a redirect URL.
5. Generate credentials for your Application. Click on Generate button. Copy generated private key. Find client ID.