@Rahul Rafaliya In this scenario, it is advisable to design three distinct marketing campaigns since the products vary, and each one has a different subscription period. Additionally, it would be more effective to notify customers about the impending expiration of their product warranty within a specific timeframe rather than sending all notifications at once. This tailored approach ensures a more personalized and strategic communication strategy for each product. Furthermore, to streamline the notification process for above mentioned usescase, I recommend utilizing the workflow mechanism in Sangam CRM. Leveraging this feature allows for real-time messaging to customers, and if you have a Gallabox subscription, you can even send WhatsApp messages for a more immediate and interactive communication experience.