With the following steps, you can re-authorize your Lightspeed integration. Make sure you have your Lightspeed login details to hand!
When you're logged in to L1NDA, go to Office;
Go to Lightspeed L- Series under the heading "Integrations".
Select a branch and click on the button to go to step 2;
Click on 'Status' and change from 'Enabled' to 'Disabled'. Save this.
Once you have done this, follow the steps to re-authorise through this article.