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I am unable to use any of these successfully.

Twitter Config

 
 "client_id": "",
 "redirect_uri": "https://callback.com/landing/twitter/login",
 "authorization_scope": "read",
 "discovery_uri": "",
 "authorization_endpoint_uri": "https://api.twitter.com/oauth/authorize",
 "token_endpoint_uri": "https://api.twitter.com/oauth/token",
 "registration_endpoint_uri": "",
 "user_info_endpoint_uri": "https://api.twitter.com/1.1/account/verify_credentials.json",
 "https_required": true

The error for twitter is

Paypal Config

 "client_id": "",
 "redirect_uri": "https://callback.com/landing/paypal/login",
 "authorization_scope": "openid email phone address profile",
 "discovery_uri": "",
 "authorization_endpoint_uri": "https://www.paypal.com/signin/authorize",
 "token_endpoint_uri": "https://api.paypal.com/v1/oauth2/token",
 "registration_endpoint_uri": "",
 "user_info_endpoint_uri": "https://api.paypal.com/v1/oauth2/token/userinfo",
 "https_required": true

Paypal I am able to open the page and signin. I get failure at authorization code exchange.

Linkedin Config

 "client_id": "",
 "redirect_uri": "https://callback.com/landing/linkedin/login",
 "authorization_scope": "r_basicprofile r_emailaddress rw_company_admin w_share",
 "discovery_uri": "",
 "authorization_endpoint_uri": "https://www.linkedin.com/oauth/v2/authorization",
 "token_endpoint_uri": "https://www.linkedin.com/oauth/v2/accessToken",
 "registration_endpoint_uri": "",
 "user_info_endpoint_uri": "https://api.linkedin.com/v2/me",
 "https_required": true

The signin proceeds for linkedin and the redirect page is opened, with the code in the url. The flow stops there. So would I need to capture this on the server? Or AppAuth would handle it? Testing on Android Oreo.

Any suggestions?