you need a tax number from the US Tax administration. You get that by filling out a form and proving that the Netherlands have a double imposition avoidence agreement.
Then you need to fill out the corresponding tax form.
You will not be able to get paid without this procedure.
I hate to say it, but if you're also a submitter to Shutterstock, you will find better tax information there. The tax situation is the same. However from an earning point of view, Adobe has better payouts.
ABAMBO | Hard- and Software Engineer | Photographer