What is the best AP automation software to use with NetSuite? We would need it to three-way match between PO, bill and item receipt. Thanks in advance!

There are multiple AP automation out there, MineralTree, Avidxchnage and Stampli are pretty good and cost effective. Tipalti is feature rich but expensive out of all the solutions. You can also try out the new Netsuite AP automation module too (haven't used it). Zone and Company does have an AP automation suiteapp too.