New TfL app enables mobile tops up of Oyster cards
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Transport for London - There are many benefits to managing your Oyster card online. Create an online account to protect your Oyster, arrange auto top-up, see your journey history, apply for incomplete
New TfL app enables passengers to top up their Oyster card 'on the go'
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TfL Oyster and contactless app - Transport for London
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TfL Oyster and contactless – Apps on Google Play
Don't use your Oyster card if you want to avoid the £20 auto top-up, says TfL chief | Evening Standard
London's your Oyster London's your Oyster
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Flexibility in paying for travel
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