Callouts from Salesforce to Heroku can be made using:

Your organization plans to deploy an application on Heroku and has strict security policies that require all data in transit to be encrypted and prevent any direct internet access to the application. They also want to ensure that communication between their on-premise database and Heroku app is secure and private. What would be your recommendation as an architect?

Your organization has developed a new microservices architecture on Heroku. As the Salesforce Heroku Architect, you’ve been tasked with building an orchestration layer using Apache Kafka on Heroku. What is the most effective way to ensure fault tolerance for your data flows in this scenario?

You have been tasked with constructing a solution for creating an orchestration layer for a microservices architecture using Apache Kafka on Heroku. The solution must ensure that if a consumer fails, the messages it was processing are not lost. What feature of Kafka would best facilitate this?

Which Heroku feature allows you to deploy a real app complete with code, config, and add-ons already configured?