Feature Request: Add a setting to Disallow Duplicate subscriptions when creating a subscription product.

✅ New Setting: Subscription Products > "Prevent Duplicate Subscriptions" (On/Off)

Current Issue:

GHL currently allows customers to purchase multiple subscriptions for the same product, leading to accidental duplicates.

Proposed Solution:

✅ New Setting: "Prevent Duplicate Subscriptions" (On/Off)

If Enabled:

Customers trying to subscribe again receive an alert about their existing subscription.

They are given an option to reschedule their next shipment instead.

Future payments/shipments adjust accordingly.

Why This Matters:

Prevents duplicate charges and subscriptions.

Need to allow shipment adjustments instead of having to cancel and repurchase.

Reduces unnecessary support requests, errors and inaccurate tracking by having to delete and repurchase to make adjustments .