How to choose between v1 & v2 for App Store Server Notifications

Based on https://developer.apple.com/help/app-store-connect/configure-in-app-purchase-settings/enter-server-urls-for-app-store-server-notifications

It seems like we can choose between version 1 or version 2 notification

Choose either Version 1 (deprecated) or Version 2 notifications. Learn about versions of App Store Server Notifications.

However, I do not find a way to make such a choice.

Does anyone know, how I can choose between v1 or v2 notification?

We currently provide a self-hosted server endpoint built on the v1 specification. While the existing server is perfectly stable, we are evaluating a migration to v2.

Thanks.

The version selector only appears after you enter (or when editing) a URL.

Version 1 is deprecated, so Apple strongly encourages migrating to v2. The v2 format is more robust (cryptographically signed, includes more data like transaction/renewal info in JWS form, etc.).

How to choose between v1 & v2 for App Store Server Notifications
 
 
Q