Footer
Links
To build your own links set in the footer, you have to go to "Link List" module settings and click "New Block" there. Write a title, select "displayAmpFooter" hook and needed links.
Social Icons
Go to AMP Settings → Footer, and enable "Display Social Icons". Then paste links to your social account. Empty links will not be shown at the front page
Payment Icons
Go to AMP Settings → Footer, and enable "Display Payment Icons". Then select icons to show.
Copyright Text
Go to AMP Settings → Footer, and change the text
Customize Footer
You can customize the footer, add your content, remove some parts in the file
/themes/YOUR_THEME/templates/mobile/_partials/footer.tpl
Please make sure your custom code is AMP Valid. Use this tool to validate your code https://validator.ampproject.org
Video Demonstration