Email was created as a system to share information between one individual and another in a secure way with limited functionality. The only functionality that is allowed within emails is:
Think back to all of the emails you've ever received. Have you ever received one that allowed you to search or perform an action directly in an email? Given the constraints of email you should feature and promote matching gifts using text and graphics.
We suggest organizations do two things:
Because email does not allow for any functionality besides presenting text and images and then hyperlinking that text or image to a new page, you can't add Double the Donation's plugin directly into an email.