Boku Inc., a San Francisco mobile payments company that allows consumers to make payments that appear as charges on their mobile phone bills, has begun a partnership with Telefonica O2 Germany GmbH, a unit of Telefonica SA of Spain.

Boku's direct-billing service enables Telefonica O2 customers to pay for online purchases ranging from 13 cents to $42 by entering their mobile phone number during the checkout process, Ron Hirson, Boku's senior vice president of product and marketing, said in an interview. The deal was announced March 24.

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