Adaptive Card

1. First, design your card: Adaptive Card Playground
2. Once you have designed your card, come here and get your certificate for your domain.
3. Once you have a certificate, register the public part of the certificate with Microsoft on the Email developers dashboard
4. Get an Api Key for this service
5. Create the flow that will send the email
6. At the end of the flow, add a HTTP Post
7. Call the service passing your API Key, Designed Card, Sender, Recipients etc...
8. The service will sign the content, and optonally return you:
   • The signed card payload only => 'application/json'
   • The html payload to be included in the email => 'text/html'