Not to pile on, but I mostly rely on my own records more than the MSCs like the other posters who've responded.
Off the top of my head, though, A Closer Look has a good payment page. All of the companies on the sassie platform have a pretty good history on the Shop Log page. Similarly, any shops performed on iSecretShop have a good history visible on the Payments/Coupons tab.
Any company that requires you to submit an invoice usually doesn't have a very good history of payments on their site: not just Maritz. But I agree that the process for invoicing shops probably keeps me from performing more assignments for them. It just seems like an unnecessary extra step.
Shopper in California's Bay Area
Edited 1 time(s). Last edit at 11/01/2015 11:02PM by CaliGirl925.