25C Configurable Grouping Rules for Subscriptions

Summary:

1. Is it mandatory to have Grouping Rules for Subscriptions?
2. We are currently using RESTAPI to create new subscription and update existing subscription, will it require any changes to existing process.
3. If yes, kindly confirm where to make changes in the REST API payload.
4. We are not using Order Management for Subscriptions, still grouping rules required or not.

kindly suggest, so we can proceed accordingly, Otherwise this will make huge impact in our business process

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Version (include the version you are using, if applicable): 25C

Code Snippet (add any code snippets that support your topic, if applicable):