(Reuters) - Visa Inc and Mastercard Inc, the two biggest U.S. card networks, are preparing to raise certain fees levied on U.S. merchants for processing transactions from this April, the Wall Street Journal reported on Friday, citing people familiar with the matter.

Some of the changes relate to so-called interchange fees, the report said. Interchange fees are what merchants pay to banks when consumers use a credit or a debit card to make a purchase from their store.

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