Facebook acknowledged in a regulatory filing that it might reduce the percentage fee it takes from developers building on its platform if it expands its payments business beyond games.

Currently, the social network requires social games to use Facebook Credits, of which it takes a 30 percent cut of revenue when players buy virtual goods. Some developers have experimented with using Credits for digital goods like song downloads and streaming movies, but Facebook’s currency is not mandatory for these apps.

Monday’s S-1 amendment is the first time Facebook has publicly suggested that it might change its revenue share structure.

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