A user can migrate from Upstox API version v1 to v2 using the following steps
Create an UpLink app for free to access Upstox API v2. The steps to be followed are mentioned here. How to create an API app?
Once an UpLink app has been created and API credentials (API Key and Secret) received, the user can use the credentials to access Upstox API v2
The credentials are enough to start using the APIs via tools like Postman, Jupiter Notebooks, etc. A user would need to generate Authorization Code and Access Token to be able to get data from APIs. Steps for authentication are mentioned in the documentation here - Upstox Developer API - Documentation of investment and trading platform developer API
If the user is looking to build on top of the APIs, they can access the readily available SDK on GitHub and integrate the APIs using them. GitHub.
Additionally, users can generate SDK in multiple other languages using the OpenAPI Specification. Steps to generate SDK in your preferred coding language are listed here - API-Documentation /SDK-Generation
Using the above steps, users will be able to get responses from the APIs and customise the data received as per their requirements.