how do I update my credit card that pays the subscription for quickbooks

You can update your payment method by going to Subscriptions and billing, Newton.

Here's how:

1. Go to the Gear icon, then Subscriptions and billing.
   
2. In the Payment method, select Edit.
3. Enter the details.
4. Click Save.

For more information, you can visit this article: Manage billing, payment, and subscription info.

You can always revisit this thread if you have further questions about billing and subscriptions.