Hi! I bid on a job that will require me to go out and buy some things in order to deliver the finished product. The buyer is willing to cover those costs. Is is permitted to have JUST THOSE COSTS sent through PayPal so I can get the full amount needed to buy the materials? The payment for the service itself (handwriting addresses on envelopes) would go through Fiverr so the 20% can be taken out. Trying to err on the side of caution here.