Hey i hope you are doing well! Thank you for purchasing the plugin and addon
Can you please watch this video? It may help you
https://youtu.be/8ZXryannW1E?si=6fRWFNfEp8RBLCr0
If you continue to face problem in setting up QuickBooks apps, To connect with RepairBuddy we can settle some time tomorrow and i will help you creating your app in quickbooks
You should already have received addon's download link to download and install in WordPress