The Obama administration is weighing complaints from U.S. payments companies that China is violating trade rules by shutting them out of its $723 billion payment-processing market, trade representative Ron Kirk said Friday.

Kirk said the United States has not yet decided whether to file a complaint with the World Trade Organization over the rules, which block companies such as Visa Inc., American Express Co., MasterCard Inc., Discover Financial Services and First Data Corp. from processing credit- and debit-card transactions in China.

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