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1. Open WSO2 Integration Studio.
2. Go to BP Project → BPMN.
   
3. Create a new project named AppointmentCancellation.
   
4. Click Finish.
5. Right click the project in the navigator and go to New → Other and select BPMN diagram.
   
6. Select the AppointmentCancellation/src/main/resources/diagrams directory as the parent folder, and enter AppointmentCancellation.bpmn for the File name.
   
7. Click Next, select the option to create an empty diagram as shown below, and click Finish.
   
8. Let's start drawing the BPMN process diagram for the appointment cancellation process. The AppointmentCancellation canvas. The Palette on the right side of the AppointmentCancellation canvas contains all the activity symbols that will be used for drawing the process as shown below.
   
   Let's get started. You can easily drag and drop the activities from the Palette the canvas, and then update the properties and configurations of each activity as explained below.
   1. Add a StartEvent from the Start Event palette.
      

   2. Select the Properties tab, click Form, click New, update the following and click OK.

      Id	patientName
      Name	Name of the Patient
      Type	string
      Required	True

      

   3. Repeat clicking New and adding the following to add the other form properties one by one.

      Id	Name	Type	Required
      appointmentNo	Appointment Number	long	True
      doctor	Name of the Doctor	string	True
      reason	Reason for cancellation	string	True
      email	Email Address	string	True

      

   4. Add a REST Task from the WSO2 Tasks palette.
      
      Select the Properties tab, click General and give the Name as Get Appointment, then click Main config and update the following:


      Service URL	http://localhost:9090/healthcare/appointments/validity/${appointmentNo}
      HTTP method	GET
      Output Variable Mappings	noOfDays:$.status

      
      

   5. Add an Exclusive Gateway from the Gateway palette.
      
   6. Add a User Task from the Task palette and name it Appointment Control Task.
      
   7. Click Properties, click Main config  and give admin as the Assignee.
       
      

   8. In the Properties tab click Form, click New and add the following.

      Id	Name	Type	Readable	Writable	Required
      approveCancellation	Do You Approve the Appointment Cancellation Request?	enum	True	True	True

      Click New next to Form values and add the following:

      Id	Name
      approve	Approve
      reject	Reject

      

   9. Repeat clicking New and adding the following to add the other form properties one by one.

      Id	Name	Type	Variable	Readable	Writable	Required
      AppNo	Appointment Number	long	appointmentNo	True	False	True
      cancellationReason	Reason For The Cancellation	string	reason	True	False	True
      doctorName	Name of the Doctor	string	doctor	True	False	True

      

   10. Add another Exclusive Gateway from the  Gateway  palette.
       
   11. Add a REST Task from the  WSO2 Tasks palette.
       
       

       Select the Properties tab and click Main config and update the following:


       Service URL	http://localhost:9090/healthcare/appointments/validity/${appointmentNo}
       HTTP method	DELETE
       Output Variable name	status

       

   12. Add a MailTask from the Task palette below the second Parallel Gateway and name it Reject cancellation Task.
       
       Select the Properties tab and click Main config and update the following:

       To	${email}
       From	Enter a valid SMTP email address.
       Subject	Appointment cancellation rejected
       Html	Appointment cancellation request with Appointment Number ${appointmentNo} has been rejected. Thank you. Administration Department

       

   13. Add another MailTask above the second Parallel Gateway and name it Approve Cancellation Task.
       
       
       Select the Properties tab and click Main config and update the following:

       To	${email}
       From	Enter a valid SMTP email address.
       Subject	Appointment cancellation successful
       Html	Appointment cancellation request with Appointment Number ${appointmentNo} has been approved. Thank you. Administration Department

       

   14. Link each activity by hovering over the element, selecting the arrow sign and dragging it to the connecting element as shown below.
       
9. Click on the arrow leading from the first Exclusive Gateway to the Approve Cancellation Task, and in the Main config section of the Properties tab add the ${noOfDays >2} condition.
   

10. Anchor
    reject reject

    Click on the arrow leading from the first Exclusive Gateway to the Reject Cancellation Task, and in the Main config section of the Properties tab add the ${noOfDays<2} condition.
    
11. Click on the arrow leading from the second Exclusive Gateway to the Rest Task, and in the Main config section of the Properties tab add the  ${approveCancellation == 'approve'}  condition.
    
12. Click on the arrow leading from the second Exclusive Gateway to the Reject Cancellation Task, and in the Main config section of the Properties tab add the  ${approveCancellation == 'reject'}  condition.
    
13. Click the arrow leading to the Appointment Control Task, open the General tab that is under properties and note the Id.
    Example:
    
14. Click the first exclusive gateway, open the General tab that is under properties, and select the ID you noted in the above steps as the value for Default flow.
    
    
15. Save all the changes you have made.
16. Click Window -> Show View -> Other in the top menu of WSO2 Integration Studio.
    
17. Type Package Explorer in the search bar, select it and click Open.
    
18. In the Package Explorer, right-click the AppointmentCancellation project and select Create deployment artifacts. 
    
    This will create a AppointmentCancellation.bar file in the deployment folder:
    

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