Item was won on sunday, I sent an invoice tuesday hoping to prompt them into paying but so far nothing. I was going to send another invoice tomorrow requesting payment by sunday or I would start an unpaid item dispute. Is it reasonable to do so after 7 days (i know you can do it after just four but that seems a little too soon)? TBH the item has a shelf life as it were so I certainly don't want to drag it out for weeks.