I run auctions and her many previous purchases were bought over a 4-5 week period per transaction, which is why I didn't jump into an UPI before the 30th day. She'd had 5 or 6 multiple purchase transactions previously. She'd bought and paid for 80 something items, so I'd kind of built up that bit of trust with her. She'd let me know when she was done for that lot, I'd send an invoice and she'd pay within half an hour, regardless of when I sent it. Thankfully I only had to cancel 3 items when she decided to do a runner.