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The £0.10 authorisation is not settled by TfL, it is done as a pre-authorisation to ensure that the card is valid for travel. Amex do not support zero value authorisations, so a nominal amount needs to be used. Amex may reduce the £0.10 from you available
balance but this will clear after a few days.
Thank you for the clarification.
This post is from a series of posts in the group:
A discussion of trends in innovation management within financial institutions, and the key processes, technology and cultural shifts driving innovation.