Hello,
We have a strong team of experienced developers who have immense experience in developing extensions for various projects, start ups who have grown to a significant level after using the extension. Our backend team is also strong and can build scalable backend architectures for this purpose. We can even add a feature of sending an automated email for timely reminders a day or two before the subscription date along with reminders on extension.
Recently, we built a voice-to-text plugin for a start up in which we give similar reminders for users who are not using the plugin.
We look forward to discuss this further in the chat.