Salesforce to Billing System

For a client we wanted to implement an automation to trigger their billing system (Xifin) for patient billing. When a report was marked as final report we used apex to trigger the integration. This triggered a process that queried various data points, mapped the data into a JSON structure and send the data to Xifin. Xifin then requests to get the documents (ie insurance cards). After the initial post to Xifin we send a Salesforce ID to a node.js app on Heroku. This Heroku app accepts a JSON payload containing the ID so that we can query the files from Salesforce using ContentDocumentLink and send the documents to Xifin.