Ribbon, an online payment startup, said on Wednesday that it had enabled Twitter users to conduct e-commerce transactions directly from links in Twitter posts. But less than two hours after the company launched its in-stream payments service, Twitter removed it.

Ribbon co-founder and CEO Hany Rashwan said in a blog post that the company's Twitter Cards integration was taken down without notification from Twitter. His post included a screenshot indicating that the company had validated its code using a test provided by Twitter to identify incorrect API usage.

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