Grant

OAuth 2.0 in Postman

Understand the OAuth 2.0 authorization framework and how to configure grant types, token retrieval, and token refresh using Postman's OAuth 2.0 Authorization t…

Authorization Code with PKCE

The Authorization Code grant is OAuth 2.0's most secure and widely used flow, and PKCE hardens it further so it is safe for public clients like single-page app…

Choosing the Right Grant

OAuth 2.0 offers several grant types built for different trust boundaries; picking the wrong one is one of the most common real-world sources of OAuth vulnerab…

OAuth Quick Reference

A condensed lookup of OAuth 2.0 grant types, standard endpoints, token parameters, and common error codes for day-to-day implementation work.

The Client Credentials Grant

The Client Credentials grant lets a service authenticate as itself, without any user in the loop, making it the standard choice for machine-to-machine and back…

The Refresh Token Grant

Refresh tokens let a client obtain new access tokens without repeating the full authorization flow, keeping short-lived access tokens practical for long-runnin…