I am in the state of Montana, USA and have an app that my friend in the Netherlands and I built. I'm in charge of taking payments and I'm getting ready to send a payment his way. I'm wondering, what is the cheapest way to send a payment both now and long term? Right now we're not incorporated (and don't intend to be for this project) but it's something I'm considering for future projects. I guess I'm not sure how to go about this in the most legal yet cost effective manner. Any suggestions?