EngageSmart Inc.,a Massachusetts-based customer engagement and payments software company, said its initial public offering priced at $26 a share, above its proposed price range of $23 to $25. The company sold 14.5 million shares to raise $38.8 million at a valuation of $4.2 billion. The stock will start trading on the New York Stock Exchange later Wednesday, under the ticker symbol "ESMT." J.P. Morgan, Goldman Sachs, BofA Securities and Citigroup are the lead underwriters.