spring security oauth2 - OAuth storing client id and secret in database - Stack Overflow
How to Get Google App Client ID and Client Secret
Not able to send client secret with Postman's Authorize section using Oauth2. · Issue #4213 · postmanlabs/postman-app-support · GitHub
Creating an OAuth2 Client | Sage Developer
Using the OAuth 2.0 protected API
OAuth 2.0 Client Credentials: Client ID and Secret not urlencoded when using Basic Auth header · Issue #7138 · postmanlabs/postman-app-support · GitHub