Delete Webhook Subscription

This operation performs a soft delete by setting is_active = false and deleted_at = NOW(). The subscription will no longer receive webhook events.

Rules

• Only the bank account that owns the subscription can delete it.
• Attempting to delete a subscription from another account returns 404 (not 403, to avoid leaking existence).
• Deleting an already-deleted subscription returns 404.

Requires ManageWebhooks permission.