Sale.taxCategoryID must be set. For no sales tax set taxCategoryID to zero.
To resolve this error, please select a default sales tax under Shop Settings in Lightspeed Retail:
1. In Lightspeed Retail navigate to "Settings".
|2. Select "Shop Settings"|
|3. Select your Shop. Repeat Steps 3-5 if you have multiple shops.|
|4. Select a default Sales Tax from the Sales Tax drop down menu.|
5. Select "Save Changes"
Note: When utilizing the Lightspeed Retail API "None" is not a valid Default Sales Tax. Setting up and selecting a "No Tax" Sales Tax as your Shop's default will work if you need to select a 0% default tax.