Is there a way to include a paypal "Buy now" button in AMP ?

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## What's the issue?

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## How do we reproduce the issue?

If this is a bug please provide a public URL and ideally a reduced test case (e.g. on jsbin.com) that exhibits only your issue and nothing else. Then provide step-by-step instructions for reproducing the issue:

1. Step 1 to reproduce
2. Step 2 to reproduce
3. …

If this is a feature request you can use this section to point to a prototype/mockup that will help us understand the request.

## What browsers are affected?

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## Which AMP version is affected?

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