Some banks are seeing a growing incidence of fraud on Apple’s mobile-payment service as criminals exploit vulnerabilities in the verification process of adding a credit card, according to people familiar with the matter.

Banks are tightening the verification process in an attempt to curb the fraud, these people said, declining to be identified citing a confidentiality agreement with Apple.

The fraud issue was brought to light by Cherian Abraham, a payment expert who works with banks and retailers on mobile-payment strategies, in a blog post in late February. He said fraud “is growing like a weed, and the bank is unable to tell friend from foe.”

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