Consider improving the validation logic for each endpoint

[wood-push-melon]

Currently, the payload validation logic piles validation for each endpoint in a package, e.g. the validation in the group package.

It's somehow risky whenever endpoints are added and removed. (open/closed principle)

It should be improved. Some OOP design patterns might be helpful (e.g. strategy pattern).

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/IAM-953.

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[shipperizer]

a new set of API will deal with validation in a different manner, v0 API can stick with the current setup and avoid refactoring for the time being