MasterCard Inc.'s $100 million purchase of the Dublin software company Orbiscom Ltd. shows how the payment networks are trying to broaden their offerings to win and retain issuers' business.

The acquisition, announced Monday, is MasterCard's second since it went public in 2006 — it absorbed Europay France last year — and its first for a provider of ancillary services. Orbiscom's technology lets banks give their customers control over how their cards are used. For instance, consumers who do not trust online merchants with their personal information can get one-time-use account numbers.

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