Token Validation and Generation in ASP.NET – Step-by-Step Guide

When working with NSE IPO APIs or any secure third-party API, you must handle authentication tokens. Tokens are required for every subsequent request, but they also expire after a certain period (e.g., 60 minutes).

In this blog, let’s break down a real-world C# implementation for:

  • Checking if a valid token exists in the database

  • Generate a new token when expires

  • Updating the database with the latest token

  • Handling API request/response safely