Stamps.com ( STMP ) has bought ShipStation , a provider of Web-based shipping/fulfillment software for online retailers, for $50M in cash + up to 769K shares in performance earn-outs (current value of $26.5M). ShipStation, which sells its software via monthly subscription, offers automatic order import for 40+ shopping carts/marketplaces, as well as tools meant to "automatically optimize" the …
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