Hello @pexel
Please note this question is not about our plugin but the structure of AMP pages and how to import information from other domains.
To load content from other domains in an AMP page, you must include a script tag in the page that will embed the form (https://cdn.ampproject.org/v0/amp-iframe-0.1.js) and an amp-iframe tag:
<amp-iframe width="500" height="685"
sandbox="allow-scripts allow-same-origin"
layout="responsive"
frameborder="0"
src="https://www.pexpe.com/?cff-form=156">
</amp-iframe>
Learn more about the amp-iframe tag’s structure by visiting the link provided in the previous entry.
Best regards.