Marc McCabe has become a familiar name among people working in human resources departments around Silicon Valley. When it’s time to compile travel expenses for the month, McCabe, who runs the business travel group at Airbnb, would manually send out invoices and Excel spreadsheets breaking down how much a company’s employees spent on room rentals. As the number of companies using Airbnb has ballooned to 250, McCabe’s monthly e-mails and the kludgy system of creating custom coupon codes that employees must enter when booking travel have not stood the test of time.

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