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  1. In WSO2 Integration Studio, add a Property mediator just after the Get Hospital Property mediator in the In sequence of the API resource. This is used for retrieving and storing the card number that is sent in the request payload.

     

    With the Property mediator selected, access the Properties tab and fill in the information as in the following table:

    FieldValue
    Property NameSelect New Property
    New Property Namecard_number
    Property Action

    Select set

    Value TypeSelect Expression
    Value Expressionjson-eval($.cardNo)
    DescriptionGet Card Number
    Tip

    For detailed instructions on adding a Property mediator, see Mediating requests to the back-end service.

  2. Go to the first case box of the Switch mediator. Add a Property mediator just after the Log mediator to store the uri.var.hospital variable value that will be used when sending requests to ChannelingFeeEP.
     

    With the Property mediator selected, access the Properties tab and fill in the information as in the following table:

    FieldValue
    Property NameSelect New Property
    New Property Nameuri.var.hospital
    Property Action

    Select set

    Value TypeSelect LITERAL
    Property Data TypeSelect STRING
    Valuegrandoaks
    DescriptionSet Hospital Variable
  3. Similarly, add Property mediators in the other two case boxes in the Switch mediator. Change only the Value field as follows:
    • Case 2: clemency
    • Case 3: pinevalley

  4. Delete the Send mediator by right-clicking the mediator and selecting Delete from Model. Replace this with a Call mediator from the Mediators palette and add GrandOakEP from the Defined Endpoints palette to the empty box adjoining the Call mediator. 

    Replace the Send mediators in the following two case boxes as well and add ClemencyEP and PineValleyEP to the respective boxes adjoining the Call mediators.

    Info

    Replacing with a Call mediator allows us to define other service invocations following this mediator.

    Let's use Property mediators to retrieve and store the values that you get from the response you receive from GrandOakEP, ClemencyEP, or PineValleyEP.

  5. Next to the Switch mediator, add a Property mediator to retrieve and store the value sent as appointmentNumber.

     

    With the Property mediator selected, access the Properties tab and fill in the information as in the following table:

    FieldValue
    Property NameSelect New Property
    New Property Nameuri.var.appointment_id
    (This value is used when invoking ChannelingFeeEP)
    Property Action

    Select set

    Value TypeSelect EXPRESSION
    Value Expressionjson-eval($.appointmentNumber)
    DescriptionGet Appointment Number
    Note

    You derive the Value Expression in the above table from the following response that is received from GrandOakEP, ClemencyEP, or PineValleyEP:

    Code Block
    {"appointmentNumber":1,   "doctor":
        {"name":"thomas collins",
         "hospital":"grand oak community hospital",
         "category":"surgery","availability":"9.00 a.m - 11.00 a.m",
         "fee":7000.0},
   "patient":
       {"name":"John Doe",
        "dob":"1990-03-19",
        "ssn":"234-23-525",
        "address":"California",
        "phone":"8770586755",
        "email":"johndoe@gmail.com"},
   "fee":7000.0,
   "confirmed":false}

  6. Similarly, add two more Property mediators as follows. They retrieve and store the doctor details and patient details respectively from the response that is received from GrandOakEP, ClemencyEP, or PineValleyEP.

    FieldValue
    Property NameSelect New Property
    New Property Namedoctor_details
    Property Action

    Select set

    Value TypeSelect EXPRESSION
    Value Expressionjson-eval($.doctor)
    DescriptionGet Doctor Details
    FieldValue
    Property NameSelect New Property
    New Property Namepatient_details
    Property ActionSelect set
    Value TypeSelect EXPRESSION
    Value Expressionjson-eval($.patient)
    DescriptionGet Patient Details

  7. Add a Call mediator and add ChannelingFeeEP from Defined Endpoints palette to the empty box adjoining the Call mediator. 

  8. Add a Property mediator adjoining the Call mediator box to retrieve and store the value sent as actualFee. Access the Property tab of the mediator and fill in the information as in the following table:

    FieldValue
    Property NameSelect New Property
    New Property Nameactual_fee (This value is used when invoking SettlePaymentEP )
    Property Action

    Select set

    Value TypeSelect EXPRESSION
    Value Expressionjson-eval($.actualFee)
    DescriptionGet Actual Fee

    Note

    You derive the Value Expression in the above table from the following response that is received from ChannelingFeeEP:

    Code Block
    {"patientName":" John Doe ", 
 "doctorName":"thomas collins", 
 "actualFee":"7000.0"}

    Let's use the /wiki/spaces/EI6xx/pages/49612834 to construct the following message payload for the request sent to SettlePaymentEP. 

    Code Block
    {"appointmentNumber":2,
	"doctor":{
		"name":"thomas collins",
		"hospital":"grand oak community hospital",
		"category":"surgery",
		"availability":"9.00 a.m - 11.00 a.m",
		"Fee":7000.0
	},
	"patient":{
		"name":"John Doe",
		"Dob":"1990-03-19",
		"ssn":"234-23-525",
		"address":"California",
		"phone":"8770586755",
		"email":"johndoe@gmail.com"
	},
	"fee":7000.0,
	"Confirmed":false,
    "card_number":"1234567890"
}

  9. Add a PayloadFactory mediator next to the Property mediator, from the mediators palette to construct the above message payload. 

     

    With the Payloadfactory mediator selected, access the properties tab of the mediator and fill in the information as in the following table:

    FieldValueDescription
    Payload FormatSelect Inline-
    Media Type

    Select json

    		-
    Payload
    Code Block
    {
"appointmentNumber":$1,
"doctor":$2,
"patient":$3,
"fee":$4,
"confirmed":"false",
"card_number":"$5"
}
    		The message payload to send with the request to SettlePaymentEP. In this payload, $1, $2, $3, $4, and $5 indicate variables.

    We will look at adding the value for the field the Args field in the following steps.

    Tip

    To avoid getting an error message, first select the Media Type before providing the Payload.

  10. To add the Args field for the PayloadFactory mediator, click the Add (+) icon in the Args field and enter the following information as in the table below. It provides the argument that defines the actual value of the first variable used in the format definition in the previous step.

    FieldValueDescription
    TypeSelect Expression-
    Value

    $ctx:uri.var.appointment_id

    		The value for the first variable ($1) in the message payload format.
    Evaluator

    Select xml

    		Indicates that the expression provided is in XML.
    Info

    The $ctx method is similar to using the get-property method. This method checks in the message context. For more details on using this method, refer the documentation.

  11. Similarly, click Add and add more arguments to define the other variables that are used in the message payload format definition. Use the following as the Value for each of them: 

    $ctx:doctor_details
    $ctx:patient_details
    $ctx:actual_fee
    $ctx:card_number

  12. Add a Call mediator and add SettlePaymentEP from the Defined Endpoints palette to the empty box adjoining the Call mediator.
  13. Add a /wiki/spaces/EI6xx/pages/49616625 Respond mediator to send the response to the client. 
    You should now have a completed configuration that looks like this:
  14. Save the updated REST API configuration.

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  1. Create a JSON file named request.json with the following request payload.

    Code Block
    {
"name": "John Doe",
"dob": "1940-03-19",
"ssn": "234-23-525",
"address": "California",
"phone": "8770586755",
"email": "johndoe@gmail.com",
"doctor": "thomas collins",
"hospital": "grand oak community hospital",
"cardNo": "7844481124110331",
"appointment_date": "2025-04-02"
}

  2. Open a command line terminal and execute the following command from the location where the request.json file was saved:

    Code Block
    curl -v -X POST --data @request.json  http://localhost:8280/healthcare/categories/surgery/reserve  --header "Content-Type:application/json"
    Info

    This is derived from the URI-Template defined when creating the API resource.

    http://<host>:<port>/categories/{category}/reserve

    You will see the response as follows:

    Code Block
    {  
   "appointmentNo":1,
   "doctorName":"thomas collins",
   "patient":"John Doe",
   "actualFee":7000.0,
   "discount":20,
   "discounted":5600.0,
   "paymentID":"480fead2-e592-4791-941a-690ad1363802",
   "status":"Settled"
}

...