How do I use User Auth?

[grande_licas]

I’m sure this is a stupid question, but here it goes.

So, I want to check if a user follows another. I found out that GET friendships/show seemed to be the best option. I know how to authenticate with OAth 1.1, but how do I “toggle” between user and app auth? I’m confused, like very confused, I’m most likely overthinking this.

[IgorBrigadir]

The http authentication headers determine if it’s app auth call or user auth call. App only auth is the “Bearer Token”, OAuth2 OAuth 2.0 App-Only (Bearer Token) | Docs | Twitter Developer Platform . For user auth, it’s a Consumer Key & Secret, and an Access Token and Secret - 4 parts for OAuth1.0a OAuth 1.0a | Docs | Twitter Developer Platform . Whatever library you’re using should be able to do both. Sometimes for app only auth you specify the API key (Consumer key) and secret only.