Most easiest and the best way to include opt-in forms in AMP
Opt-in forms allows you to add a newsletter form to help you capture the leads to your preferred email subscription company. Which then can be used to convert them into the sales.
AMP compatible E-mail Subscription Forms
Create Unlimited Opt-in forms
Catchy Design with tons of color options to control the design.
Automatically display in the content or manually display with shortcode.
Constantly adding new opt-in company support.
+ Many other features.