If you have enabled reminders from the Razorpay Dashboard at a global level, you can still disable it for a specific link. You can do this via Dashboard and the APIs while creating and updating Payment Link.
Reminders for Payment Links
You can send automated SMS and email reminders to customers for Payment Links.
You can configure automated SMS and email reminders for all Payment Links from the Razorpay Dashboard by navigating to Settings → Reminders.
Reminders set only for Issued, Partially Paid links:
Reminders will be set only for Payment Links in
Partially Paid states.
You can disable reminders while creating Payment Links in bulk.
By default, reminders are not enabled during batch creation of Payment Links.