- Simplify SubscribeToPlanWithCurrency by creating SubscribeRequest directly instead of intermediate RatePlanSubscription struct
- Remove redundant Status, StartedAt, CreatedAt, and UpdatedAt field assignments
- Mark unused context parameters with underscore in calculateOverageCost and generateReason
- Remove unused getHighestPriorityCarrier helper function from selection_algorithm.go
- Replace getCurrentTime() calls with id.GetCurrentTime() in pricing_integration.go and pricing_service.go
- Replace generateRuleID() with id.GenerateRuleID() in pricing rule creation
- Replace generateEventID() with id.GenerateEventID() in tenant middleware
- Remove local helper functions: generateRuleID, getCurrentTime, generateEventID, generateRandomString, getCurrentTimestamp
- Remove unused time package imports