We noticed v1 to v2 migration notification on your Website? Do we need to make any changes on our code? If so, where can we see the documentation of that?

The version change notification on the website is only applicable to apps of type Access API created on our platform before 28th January 2020. If you have created an app of type Access API before the said date your set callback URL is receiving incoming event/message payload with version 1. Version v1 payload content type is application/x-www-form-urlencoded; charset=utf-8
v1 Sample payload:
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Version v2 content type is application/json; charset=utf-8This is a major change one has to make in their web-application.
For API documentation for v2 click here.