Interaction services provide interaction between applications or users. In our sample scenario, we have our service that provides interaction between two applications without the need of a third software in between. For this purpose, we have a DocumentValidity service, and we call it a notification service, which receives the notification from one service and processes it to another within the same Regulatory Affairs context (department):

    Let's view the simple code for our sample notification service: 
    /// <summary> 
    /// This API gets the notifications from the DB Documents
     Validation Notification service. 
    /// Usage: - GET api/DocumentValidity/notify?employeeId=2&docid=1 
    /// Type: Interaction Service 
    /// </summary> 
    /// <param name="employeeId"></param> 
    /// <param name="docId"></param> 
    /// <returns></returns> 
    [HttpGet("Notify")] 
    public IActionResult Notify(int employeeId, int docId) 
    { 
      soaContext = new SOAContext(); 
      soaContext.Initialize(); 

      //Start document validation/expiry process by 
      invoking DocumentSubmitter to Authorities depending
      on the type of the document 
      DocumentSubmitterProxy.ProcessDocumentSubmission(
        employeeId, docId); 

      soaContext.Close(); 
      return new OkResult(); 
    }