Thanks for joining the thread, @juma1.

Let me join in this conversation and share with you additional info about importing customer payments in QuickBooks. 

If you're trying to import data in XLS format, you have to use convert it to CSV, QFX, QBO, OFX file formats first. You can do this using a file format converter tool which you can find outside QuickBooks. 

You can also search for free file converters on web browsers. This way, you don't have to pay for another app and accomplish your task.

Once done, here's how to import bank transactions into QuickBooks Online. 

Let me know if you need any additional assistance or clarification. We are here to lend a helping hand always. Have a good one.