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New Oyster upgrade and app to make topping up while on the move easier than ever — MayorWatch
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Don't use your Oyster card if you want to avoid the £20 auto top-up, says TfL chief | Evening Standard
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Oyster card - Wikipedia
How can I provide a receipt when using contactless on the London underground? : Giltbyte Helpdesk
Oyster pay as you go - Transport for London
How to Auto Top Up a child's TFL Zip Oyster Photocard - Tech Advisor
How to top up your Oyster Card | Oyster card in London | London Travel Guide - YouTube
How to Auto Top Up a child's TFL Zip Oyster Photocard - Tech Advisor
