March 2 : SoftBank's PayPay is targeting a valuation of up to $13.4 billion in its U.S. initial public offering, pressing ahead despite volatile markets in what could be among the largest U.S. listings by a Japanese firm. The U.S. IPO market has started the year on shaky footing, with market swings prompting some companies to delay flotation plans. Analysts said a strong PayPay debut could help lift investor confidence despite the turbulence. The Japanese payments app and its backer plan to