Square Inc., the mobile-payment startup, said Chief Operating Officer Keith Rabois has resigned, marking the departure of an executive who has helped the company grow to more than 3 million customers.

Chief Financial Officer Sarah Friar will become acting COO, San Francisco-based Square said yesterday in a statement. Friar joined the startup in June after a stint at Salesforce.com Inc. Rabois, who previously worked at PayPal Inc. and LinkedIn Corp., joined Square in 2010 to help with marketing and business development.

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