QB Issue Resolution:

use an estimate for orders, estimates are non posting

then convert the estimate to an invoice, receive payment on the invoice (not an option to use sales receipt from estmate)

Resolution for Issue 'How do I show pending orders in Quickbooks Online?' available: Yes (Solved).
Source: Intuit Community forum.

How do I show pending orders in Quickbooks Online?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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