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Note that the linked article title is "Twitter Announces Its First Commerce Product — A 'Buy' Button On Mobile"

It doesn't mention any particular service. (I point this out because the HN submission title change may favor a particular payment service, whether intentionally or unintentionally.)

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Thanks for pointing it out. I just added Gumroad, Stripe because they are well-known here in the HN community, and I though it was interesting to know (even if you don't read the whole article).

As the HN guidelines ask, please don't rewrite titles unless they are linkbait or misleading.

Didn't know about any guidelines, now I know.

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