If your Lightspeed integration does not work anymore, checking the Lightspeed domain could fix it.
For this, follow these steps:
Go to your Lightspeed Retail connection page
Check the URL and copy the link up to the .com
Connect to your Booxi account
Go to My Business tab
Click on “Integration modules”
Under Lightspeed Retail, click on the setup button
In the panel, under "Lightspeed Domain", paste the URL you copied earlier
Click on Save
Your new domain should be set up and pushing a sale through Booxi to Lightspeed should work again.