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Integrating with a third-party merchant services is unavailable in QuickBooks Online. You'll want to record the transactions manually, or sign up for QuickBooks Payments. I've got this article for more details: Connect your QuickBooks Payments account to QuickBooks Online.
For recording the payment manually, you can follow these steps:
- On the left navigation menu, select + New.
- Under Customers, select Receive payment.
- Enter the payment information and make sure to choose Undeposited Funds from the Deposit To drop-down menu.
- Hit the Save and Close button.
Once done, record a deposit and select the payment you just recorded.
Here's how:
- From the + New menu, select Bank deposit.
- Under Select the payments included in this deposit, put a check mark on the payment.
- Click the Save and close button.
Please see this sample screenshot below:

You can use these articles for reference:
If you have any other questions or concerns, please let me know. I'll be around to help you some more. Thanks.