Groupon, which recently entered the payments market with the introduction of a mobile card reader, promoted Kal Raman to chief operating officer, enlisting the former eBay Inc. executive to jump-start growth in suffering overseas operations.

An e-commerce veteran who also worked at Amazon.com Inc., Raman joined Groupon in April as senior vice president in charge of sales and operations, the company said in a statement yesterday. Margo Georgiadis last held the COO job before she left in September 2011 to rejoin former employer Google Inc. after less than a year.

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