Currently Kalix does not directly integrate with Quickbooks. However, you can import billing and payment details from Kalix into Quickbooks. Just follow the instructions below.
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You can import billing and payment information out of Kalix in the file formats of CSV and Excel files. For instructions on how to do this click here.

Unfortunately Quickbooks only accepts a non standard file format as imports (IIF files, Intuit Interchange Format). Click here for instructions about creating this file type.
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The instructions are fairly complex. There are a number of apps that you can purchase that converts files into Quickbook's required format or imports files for you.
For example:

Now you can import your billing and payment details into Quickbooks, click here for details.