NewConflictError return either 409 for any conflict state on the database like unique index and so on or 500 in case the db connection died or others.

NewNotFoundError return either 404 for resources that are not found in the database or 500 in case the db connection died or others.

NewRepositoryError returns a 500 in case the db connection died or others.

NewServiceError returns 500 when a service/third party fails.

NewRateLimittedError returns 429 when it has too many request.