How does Product Sync Work on WooCommerce?
You can enable TOT's Product Sync on WooCommerce by going to Token of Trust / WooCommerce on within the WP Admin area, scrolling down until you see the Product Sync enable field as shown here. Click to enable and save:

Once this setting is enabled Token of Trust will require that vape taxation fields are supplied for every product that is marked exempt (see below).

You can correct this in one of two ways:
1) Mark the product exempt:
This tells Token of Trust that this product is not a taxable product under vape law.
2) Supply the fields required to allow for taxation:

Either way, Token of Trust product metadata will be automatically updated every time you change this information.
For detailed information about the fields please take a look at the guide here: https://help.tokenoftrust.com/article/685-what-is-product-metadata
Please note that Token of Trust uses this information to calculate your taxes so you'll want to ensure that this is correct.