Hello, Moen1.
Yes, that is correct. The Merchant Card Processor Account number is your checking number that is connected.
I also encourage you to review some of our commonly asked payment questions through this article: QuickBooks Payments FAQ. Visit our QuickBooks Payments page for more insights about managing your customer payments on your account.
If you have any additional questions or concerns, please let me know and I'll gladly answer them. Do you want to do something else in QuickBooks or the Merchant Service Center? If so, please lay down what you need to do and I'll guide you.