Take a photo of the barcode/save the email and let them scan your phone screen?
Disclaimer: this will probably not work.
@Sparky started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Take a photo of the barcode/save the email and let them scan your phone screen?
Disclaimer: this will probably not work.