Visa Inc., a payment processor, announced on Saturday that it will begin categorising sales at gun stores separately.

 Visa, Mastercard, and American Express.

a significant victory for gun control proponents who claim it will make it easier to monitor suspicious sales spikes.

However, the move by Visa, the biggest payment processor in the world, is likely to infuriate supporters of gun rights.

pro-gun advocates, who contend that classifying gun sales would unfairly mark an industry

 Visa, Mastercard, and American Express.

when few purchases result in mass shootings. It combines with American Express and Mastercard.

 Visa, Mastercard, and American Express.

which also declared their intention to proceed with classifying gun store transactions. Visa

 Visa, Mastercard, and American Express.

said that it would implement the new merchant code for gun sales from the International Organization for Standardization

it was made public on Friday. Gun store sales were categorised as "general items" up until Friday.

 Visa, Mastercard, and American Express.

"Visa will move on with the following procedures in light of ISO's decision to establish a new merchant category code."

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