Amazon's pay-by-palm technology is being tested in select Panera locations in the US. JP Morgan will also begin piloting biometrics-based payments with US retailers this year.

According to Google Intelligence, global biometric payments are expected to reach $5.8 trillion and three billion users by 2026.

Are shoppers ready for this next level of convenience? How will Amazon benefit? And how can linking loyalty programmes create a more personalised (perhaps too personalised) experience?

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