Customer's automatic credit card charge was processed on 3/10 when customer should not have been charged until 4/1. Why did this happen? How do I reverse the charge?

You can void the payment or issue a refund to the customer card, tom159.

Refunds can only go back to the same account used for the transaction and are limited to the amount of the original sale. Here's how it's done:

1. From the + New button, click Refund receipt.
2. Select the customer you want to give a refund to from the Customer drop-down, then fill out the other fields with the correct details.
3. Choose and select the payment method and account.
4. Enter the product/service & amount to be refunded.
5. Select Save and close. If you want to send a receipt to your customer, select Save and send.

If you have QuickBooks Payments, you can also access your Merchant account to issue refunds.

Also, just make sure that the dates and intervals are set correctly. For more details, you can check out the recurring transactions article. 

Keep me posted if there's anything else that you need help with. Take care and have a great day!

Had the same issue. How can this be done on the desktop version?

I've got the steps you'll need on how to do it on the desktop version, Rollins Landscape Admin.

You either void the payment or issue a refund to your customer. When you void a payment, QBDT keeps track of this for you. With a refund, you get charged more in fees, and it can take several days for your customer to get their money back. 

To refund a payment:

1. Sign in to QuickBooks Payments from QuickBooks Desktop.
2. Select the Customers menu and then Credit Memos/Refunds.
3. In the Customer: Job dropdown, select the customer you need to refund.
4. Enter the products and services you need to refund.
5. When you're done, select Save & Close. This opens an Available Credit window.
6. Select Give a refund and then OK. Or select Retain as an available credit and then OK.
7. In the Issue a Refund window, select how you want to refund the transaction from the Issue this refund via field. If you select Cash or Check, select the account you're paying for the refund from.
8. For credit card payments
   > In the Issue this refund via field, select the type of credit card you need to refund.
   > Enter the credit card info, or select Swipe card and swipe the customer’s card.
   > Select the Process credit card refund checkbox.
9. Click OK when you're ready.

For additional details regarding refunding payments, please refer to this article: Void or refund customer payments in QuickBooks Desktop.

Also, check this link that will help you manage recurring payments in QBDT.

Please reach back out to me with any additional information on this so I can get you taken care of.