You must be able to provide evidence of the payments you've made, through bank statements or similar. (moneyadviceservice.org.uk)
Copies of all payment advances or other evidence of payment, if any, received by the debtor from an employer within 60 days before the filing of the petition (rocketlawyer.com)
If loss or damage to your property occurred while in the care of a public carrier (airline, busline, taxi, ship, etc.) or other responsible party (hotel, restaurant, etc.)- you must provide us with evidence of payment, claim denial, or other disposition from the responsible party (retain originals for your records). (tmtsf.ca)