When you buy items or services in New Jersey, you generally pay Sales Tax on each purchase. The seller (a store, service provider, restaurant, etc.) collects tax at the time of the sale and sends it to the State. The law exempts some sales and services from Sales Tax.
Third Party Apps orders are received on devices separate from your POS. Managing these apps through your POS creates better workflows and will save you lots of time and money when paying your sales tax.