How do I change my credit card number that I pay monthly with?

I'll share with you the two options to change the credit card details for your QuickBooks Online (QBO) subscription, @Benjamin Mabry. 

If you subscribed to QBO through a web browser, let's log into your account as the Master or Company Admin. Then, proceed with the steps below. 

1. Go to the Settings (Gear) icon at the upper right.
2. Select Account and Settings under Your Company. 
3. Go to Billing & Subscription from the left menu. 
4. Click the Edit (Pencil) icon beside Payment Method.
5. Update your credit card number and the details. 
6. Make sure the Billing Address in the program is the same as the one on your credit card statement.
7. Click Save.

The screenshot below shows you the last five steps.

If you subscribed to QBO through an app store, let's either go to Google Play (Android) or App Store (iPhone or iPad) to update your payment info.

Here are the steps for Google Play (Android): 

1. Open a web browser.
2. Log into your Google Wallet account.
3. Select Payment methods.
4. Locate the card you want to update.
5. Choose Edit.
6. Make the necessary changes.
7. Click Save.

For App Store (iPhone or iPad), just go to your device’s Settings menu and select iTunes App Store. Enter your Apple login credentials. Then, click Manage under Subscriptions and choose QuickBooks Online. Update your credit card info from there. 

To learn more about the process above, check out this article: Update Your Payment Information For Your Subscription. 

Aside from updating your credit card details, you can view your payment history in the Billing & Subscription tab. You can also change your billing cycle and upgrade or downgrade your subscription. This page helps you manage your payment and plan info in QBO. For more details, visit this article: Update Your Billing & Subscription Info. 

I'm just a comment away if you need anything else. Take care always. Stay healthy, @Benjamin Mabry.