As required by law, Walmart collects and remits state sales tax on all taxable marketplace sales shipped to certain states. You can find the specific states under the 'State-Specific Laws for Marketplace Facilitators' section of Walmart's 'Sales Tax Collection Overview' (https://sellerhelp.walmart.com/s/guide?article=000006444)
FarApp automatically detects when Walmart has already collected and remitted tax for an order. FarApp then posts the order to Netsuite with a tax rate of 0.00. You can still view the tax amount in FarApp by selecting 'Edit' under the Action button on the far right of the order on the Orders page.