Q: How do I update the credit card on file with SKU Grid for payment?
A: Credit cards for credit card (direct/stripe payments) cannot be updated. You'll need to go to the Subscriptions tab and click the Unsubscribe link on your subscription to cancel the future recurring payments on that subscription plan. Then when it is time to renew again, you would need to sign up for a new subscription using the method of payment of your choice.