The app shows an estimate. Final pay uses verified weight x rate at pickup.
Yes. Open Profile → Saved addresses, or change address from Home header.
On Home cards (short form) and full Order ID on pickup detail / payment receipt.
After pickup, open History or Done on Home → Payment. You see the same “Paid to you” amount the collector recorded.
Open the order detail and tap Message after a collector is assigned. After the pickup is completed, chat and contact are closed for both sides.