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In EI Tooling, add a Property mediator just after the Get Hospital Property mediator in the In sequence of the API resource to retrieve and store 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:
Field
Value
Property Name Select New Property
New Property Name card_number
Property Action
Select set
Value Type Select Expression
Value Expression json-eval($.cardNo)
Description Get Card Number
Tip
For detailed instructions on adding a Property mediator, see Mediating requests to the back-end service.

Go to the first case box of the Switch mediator. Add a Property mediator just after the Log mediator to store the value for uri.var.hospital variable 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:

Field	Value
Property Name	Select New Property
New Property Name	uri.var.hospital
Property Action	Select set
Value Type	Select LITERAL
Property Data Type	Select STRING
Value	grandoaks
Description	Set Hospital Variable

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
Delete the Send mediator by right clicking on 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.

Next to the Call mediator box, 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:

Field	Value
Property Name	Select New Property
New Property Name	`uri.var.appointment_id` (This value is used when invoking ChannelingFeeEP)
Property Action	Select set
Value Type	Select EXPRESSION
Value Expression	`json-eval($.appointmentNumber)`
Description	Get 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}

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.

Field	Value
Property Name	Select New Property
New Property Name	`doctor_details`
Property Action	Select set
Value Type	Select EXPRESSION
Value Expression	`json-eval($.doctor)`
Description	Get Doctor Details

Property Name	Select New Property
New Property Name	`patient_details`
Property Action	Select set
Value Type	Select EXPRESSION
Value Expression	`json-eval($.patient)`
Description	Get Patient Details

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

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:

Field	Value
Property Name	Select New Property
New Property Name	`actual_fee` (This value is used when invoking SettlePaymentEP )
Property Action	Select set
Value Type	Select EXPRESSION
Value Expression	`json-eval($.actualFee)`
Description	Get 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 PayloadFactory mediator to construct the following message payload for the request sent to SettlePaymentEP.

Code Block

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

Next to the Property mediator, add a PayloadFactory 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:

Field	Value	Description
Payload Format	Select Inline	-
Media Type	Select json	-
Payload	{ "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 Args in the following steps.

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

To add the Args field for the PayloadFactory mediator, click the Browse (...) icon in the Args field. Click on the Add button 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.

Field	Value	Description
Type	Select 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.

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
Add a Call mediator and add SettlePaymentEP from Defined Endpoints palette to the empty box adjoining the Call mediator.
Add a Respond mediator to send the response to the client.

You should now have a completed configuration that looks like this:
Save the updated REST API configuration.

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