consolibyte/quickbooks-php — pull request #1 by aj0y (2013-02-09 00:13:04+00:00)
Title: Update QuickBooks/IPP/Service/SalesReceipt.php

added findById function to SalesReceipt Service, since it seems to be supported by IDS : https://ipp.developer.intuit.com/0010_Intuit_Partner_Platform/0050_Data_Services/0400_QuickBooks_Online/SalesReceipt

I have tested it and it works.