People taking BART will soon be able to use their credit or debit cards at the fare gates, according to the Metropolitan Transportation Commission.

The tap-to-pay feature launches the week of Aug. 18, according to the Clipper Executive Board . Valid cards include Visa, Mastercard, American Express and Discover. Payment options also include Apple Pay or Google Pay with a phone or watch.

With the rollout of the new feature, there are some possible issues people with Clipper cards could face, such as "card clash."

Jason Weinstein, the director of Clipper at MTC, explained during a July 28 meeting that card clash happens when a Clipper reader detects more than one card.

How to avoid card clash depends on whether people use a physical Clipper card or a digital wallet. People with a plas

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