# Customer Onboarding Guide
source: https://developer.mastercard.com/india-online-dispute-resolution/documentation/onboarding-guide/index.md

This tutorial will explain how to create a simple API client.

## Environment setup {#environment-setup}

1. Create a Maven project.

* In the IDE, create a new Maven project (for example, **IndiaOnlineDisputeResolutionTutorial**) which sets your directory structure automatically.
* Provide an **ArtifactId** and a project name as per your choice.

2. Add resources.

* Add the IODR [API specification](https://developer.mastercard.com/india-online-dispute-resolution/documentation/api-reference/index.md#apis) to your resources folder of Maven project.
* Add the generated sandbox key, Mastercard encryption key, and encryption certificate to your Maven project resources folder. This is generated while creating the project on Mastercard Developers.
* Your Maven project directory structure appears:

![add_resource1](https://static.developer.mastercard.com/content/india-online-dispute-resolution/uploads/add_resource1.png)

3. Update the pom.xml file.

```XML
<build>
        <plugins>
            <plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>5.2.1</version>
                <executions>
                    <execution>
                        <id>IODR API REST Client</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>
                                ${project.basedir}/src/main/resources/india-online-dispute-resolution-api-swagger.yaml
                            </inputSpec>
                            <generatorName>java</generatorName>
                            <generateApiTests>false</generateApiTests>
                            <generateModelTests>false</generateModelTests>
                            <configOptions>
                                <sourceFolder>src/gen/java/main</sourceFolder>
                                <hideGenerationTimestamp>true</hideGenerationTimestamp>
                                <dateLibrary>java8</dateLibrary>
                            </configOptions>
                            <typeMappings>
                                <typeMapping>Date=LocalDate</typeMapping>
                            </typeMappings>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
```

* Add the following dependencies to your pom.xml file to generate the API client library and the Mastercard OAuth1 Signer library.   
  The Mastercard OAuth1 Signer library provides code helpers for HTTP clients used for various OpenAPI Generator Library templates.

**Dependencies**

```XML
<properties>
        <java.version>17</java.version>
        <spring.boot.version>2.5.3</spring.boot.version>
        <org.projectlombok.version>1.18.16</org.projectlombok.version>
        <okhttp-version>4.9.1</okhttp-version>
        <commons-lang3-version>3.11</commons-lang3-version>
        <javax-annotation-version>1.3.2</javax-annotation-version>
        <oauth1-signer-version>1.5.1</oauth1-signer-version>
        <client-encryption-version>1.8.2</client-encryption-version>
        <junit-version>4.13.1</junit-version>
        <gson-version>2.8.6</gson-version>
        <gson-fire-version>1.8.5</gson-fire-version>
        <swagger-core-version>1.6.2</swagger-core-version>
        <javax-annotation-version>1.3.2</javax-annotation-version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <default.package>com.mastercard.developers.iodr</default.package>
        <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>
    <dependencies>
        <!-- Dependency for building web, including RESTful, applications using
                Spring MVC -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${spring.boot.version}</version>
        </dependency>
        <!-- Spring Boot Developer Tools Dependency -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <version>${spring.boot.version}</version>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <!-- Spring data Core Dependency -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-commons</artifactId>
            <version>2.5.0</version>
        </dependency>
        <!--Square's meticulous HTTP client for Java -->
        <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>${okhttp-version}</version>
        </dependency>
        <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>logging-interceptor</artifactId>
            <version>${okhttp-version}</version>
        </dependency>
        <!--Gson is a Java library that can be used to convert Java Objects into
                their JSON representation. -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>${gson-version}</version>
        </dependency>
        <!--A java library that adds some very useful features to Gson, like Date
                serializing to unix timestamp or RFC3339, method (getter) serialization,
                pre and post processors and many more. -->
        <dependency>
            <groupId>io.gsonfire</groupId>
            <artifactId>gson-fire</artifactId>
            <version>${gson-fire-version}</version>
        </dependency>
        <!--The Apache Commons Lang 3 library is a popular, full-featured package
                of utility classes, aimed at extending the functionality of the Java API. -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>${commons-lang3-version}</version>
        </dependency>
        <!--The purpose of this library is to make it provide a J2CL compatible
                library.Common Annotations for the JavaTM Platform API -->
        <dependency>
            <groupId>javax.annotation</groupId>
            <artifactId>javax.annotation-api</artifactId>
            <version>${javax-annotation-version}</version>
        </dependency>
        <!--Zero dependency library for generating a Mastercard API compliant OAuth
                signature. -->
        <dependency>
            <groupId>com.mastercard.developer</groupId>
            <artifactId>oauth1-signer</artifactId>
            <version>${oauth1-signer-version}</version>
        </dependency>
        <!-- Dependency for Client Encryption -->
        <dependency>
            <groupId>com.mastercard.developer</groupId>
            <artifactId>client-encryption</artifactId>
            <version>${client-encryption-version}</version>
        </dependency>
        <!--Swagger Core is a Java implementation of the OpenAPI Specification -->
        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-annotations</artifactId>
            <version>${swagger-core-version}</version>
        </dependency>
        <!--FindBugs is a defect detection tool for Java that uses static analysis
                to look for more than 200 bug patterns -->
        <dependency>
            <groupId>com.google.code.findbugs</groupId>
            <artifactId>jsr305</artifactId>
            <version>3.0.2</version>
        </dependency>
        <!-- OpenAPI Generator Dependencies -->
        <dependency>
            <groupId>org.openapitools</groupId>
            <artifactId>jackson-databind-nullable</artifactId>
            <version>${jackson-databind-nullable-version}</version>
        </dependency>
        <!--The Apache Commons IO library contains utility classes, stream implementations,
                file filters, file comparators, endian transformation classes, and much more. -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

        <dependency>
             <groupId>log4j</groupId>
             <artifactId>log4j</artifactId>
             <version>1.2.14</version>
        <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>com.vaadin.external.google</groupId>
                    <artifactId>android-json</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.junit.jupiter</groupId>
                    <artifactId>junit-jupiter-engine</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.mockito</groupId>
                    <artifactId>mockito-junit-jupiter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-inline</artifactId>
            <version>3.0.0</version> <!-- Or latest -->
            <scope>test</scope>
        </dependency>
    </dependencies>
```

For more information, refer [Generating and Configuring a Mastercard API Client](https://developer.mastercard.com/platform/documentation/security-and-authentication/generating-and-configuring-a-mastercard-api-client/#overview).

## Setting up the project {#setting-up-the-project}

1. Navigate to the root directory of the project within a terminal window and run `mvn clean install`. ![maven_comm_clean2](https://static.developer.mastercard.com/content/india-online-dispute-resolution/uploads/maven_comm_clean2.png) A folder named **target** is created within your root directory, which contains classes generated for the schemas and API calls defined within the OpenAPI Specification. ![iodr_target_jar1](https://static.developer.mastercard.com/content/india-online-dispute-resolution/uploads/iodr_target_jar1.png)
2. Following are the steps to create a sample project with an open API generator.  
   a. Create a Java file **IODRApiClient.java** at src/main/java/.   
   b. To make the API call, add the following OAuth credentials in **IODRApiClient.java** .   
   c. Create a java test file **IODRApiTest.java** at src/test/java/.

**OAuth**

```java
    String consumerKey = "<Consumer_key from your Mastercard Developer's project>";
    String signingKeyFilePath = "./src/main/resources/client p12 file name downloaded on project creation>.p12";
    String encryptionCertPath = "./src/main/resources/<pem file name downloaded on project creation>.pem";
    String mcKeyFilePath = "./src/main/resources/<mastercard p12 file name downloaded on project creation>.p12";
    String signingKeyAlias = "<key_alias id provided at the time of project creation>";
    String mcKeyAlias = "<mc_key_alias id provided at the time of project creation>";
    String mcKeyPassword = "<mc_key_password provided at the time of project creation>";
    PrivateKey signingKey = AuthenticationUtils.loadSigningKey(signingKeyFilePath, signingKeyAlias,
        signingKeyPassword);
```

**Content of IODRApiClient.java**

```java
package com.mastercard.odr;

import java.security.PrivateKey;
import java.security.cert.Certificate;

import com.mastercard.developer.interceptors.OkHttpJweInterceptor;
import com.mastercard.developer.interceptors.OkHttpOAuth1Interceptor;
import com.mastercard.developer.utils.AuthenticationUtils;
import com.mastercard.developer.utils.EncryptionUtils;
import com.mastercard.developer.encryption.JweConfig;
import com.mastercard.developer.encryption.JweConfigBuilder;
import org.springframework.stereotype.Service;

@Service
public class IODRApiClient {

    public  ApiClient getApiClient(boolean enableEncryption) throws Exception {
        ApiClient client = new ApiClient();

        String consumerKey = "<Consumer_key from your Mastercard Developer's project>";
        String signingKeyFilePath = "./src/main/resources/client p12 file name downloaded on project creation>.p12";
        String encryptionCertPath = "./src/main/resources/<pem file name downloaded on project creation>.pem";
        String mcKeyFilePath = "./src/main/resources/<mastercard p12 file name downloaded on project creation>.p12";
        String signingKeyAlias = "<key_alias id provided at the time of project creation>";
        String signingKeyPassword = "<key_password provided at the time of project creation>";
        String mcKeyAlias = "<mc_key_alias id provided at the time of project creation>";
        String mcKeyPassword = "<mc_key_password provided at the time of project creation>";
        PrivateKey signingKey = AuthenticationUtils.loadSigningKey(signingKeyFilePath, signingKeyAlias,
                signingKeyPassword);

        client.setBasePath("https://mtf.api.mastercard.co.in/iodr");
        client.setDebugging(true);

        if (enableEncryption) {
            client.setHttpClient(client.getHttpClient().newBuilder()
                    .addInterceptor(new OkHttpJweInterceptor(getEncryptionDecryptionConfig(encryptionCertPath,mcKeyFilePath, mcKeyAlias, mcKeyPassword)))
                    .addInterceptor(new OkHttpOAuth1Interceptor(consumerKey, signingKey)).build());
        } else {
            client.setHttpClient(client.getHttpClient().newBuilder()
                    .addInterceptor(new OkHttpOAuth1Interceptor(consumerKey, signingKey)).build());
        }
        return client;

    }

    private  JweConfig getEncryptionDecryptionConfig(String encryptionCertPath, String keyFile, String keyAlias, String password) {
        JweConfig config = null;
        try {
            Certificate encryptionCertificate = EncryptionUtils.loadEncryptionCertificate(encryptionCertPath);
            PrivateKey key = EncryptionUtils.loadDecryptionKey(keyFile, keyAlias, password);
            config = JweConfigBuilder.aJweEncryptionConfig().withEncryptionCertificate(encryptionCertificate)
                    .withEncryptionPath("$", "$").withEncryptedValueFieldName("encryptedValue")
                    .withDecryptionKey(key).withDecryptionPath("$.encryptedValue", "$")
                    .build();
        } catch (Exception e) {
            System.out.println(e);
        }
        return config;
    }

}
```

**Content of IODRApiTest.java**

```java
package com.mastercard.odr;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.openapitools.client.api.IodrApi;
import org.openapitools.client.model.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import java.util.UUID;


@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { IODRApiClient.class })
public class IODRApiTest {

    @Autowired
    IODRApiClient iodrApiClient;

    IodrApi iodrApi;
    IodrApi iodrApiClientForEncryptionDecryption;

    @Before
    public void setUp() throws Exception {
        iodrApi = new IodrApi(iodrApiClient.getApiClient(false));
        iodrApiClientForEncryptionDecryption = new IodrApi(iodrApiClient.getApiClient(true));
    }
    @Test
    public void testCreateComplaintsAPIWithPositiveScenario() throws Exception {

        try {
            String requestId = UUID.randomUUID().toString();
            CreateComplaint createComplaintRequestPayload = getCreateComplaintRequest();
            System.out.println("Calling create a new complaint API Positive Scenario with requestID "+requestId +" and request payload "+ createComplaintRequestPayload);
            Complaint createComplaintResponse = iodrApiClientForEncryptionDecryption.createComplaint(requestId, createComplaintRequestPayload);
            Assert.assertEquals("Complaint created successfully.", createComplaintResponse.getDescription());
            System.out.println("Calling create a new complaint API response : "+ createComplaintResponse);

        } catch (Exception e) {
            System.out.println("Create a new complaint API Call failed with error msg : "+ e.getMessage());
            Assert.assertNotNull(e.getMessage());

        }
    }

    @Test
    public void testCreateComplaintsAPIWithNegativeScenario() throws Exception {

        try {
            String requestId = UUID.randomUUID().toString();
            CreateComplaint createComplaintRequestPayload = getCreateComplaintRequest();
            createComplaintRequestPayload.setCardNumber("");
            System.out.println("Calling create a new complaint API with Negative Scenario requestID : "+requestId+ " and request payload : {}"+ createComplaintRequestPayload.toString());
            Complaint createComplaintResponse = iodrApiClientForEncryptionDecryption.createComplaint(requestId, createComplaintRequestPayload);

            System.out.println("Calling create a new complaint API response with Negative Scenario : " + createComplaintResponse.toString());

        } catch (Exception e) {
            System.out.println("Create a new complaint API Call failed with error msg with Negative Scenario: " + e);
            Assert.assertNotNull(e.getMessage());
        }
    }

    @Test
    public void testValidateTransactionStatusWithPositiveScenario()  {
        try {
            String requestId = UUID.randomUUID().toString();
            IODRTransactionValidation iodrTransactionValidationRequestPayload = getValidateTransactionRequest();
            System.out.println("Calling validate transaction details API with requestID : " + requestId + " and request payload : " + iodrTransactionValidationRequestPayload.toString());
            Detail validateTransactionDetails = iodrApiClientForEncryptionDecryption.validateTransaction(requestId, iodrTransactionValidationRequestPayload);

            System.out.println("Calling validate transaction details API response : " + validateTransactionDetails.toString());

        } catch (Exception e) {
            System.out.println("Validate transaction details API Call failed with error msg " + e);
            Assert.assertNotNull(e);
        }
    }
    @Test
    public void testValidateTransactionStatusWithNegativeScenario() {
        try {
            String requestId = UUID.randomUUID().toString();
            IODRTransactionValidation iodrTransactionValidationRequestPayload = getValidateTransactionRequest();
            iodrTransactionValidationRequestPayload.setAcquirerICA("");
            System.out.println("Calling validate transaction details API with requestID : " + requestId + " and request payload : " + iodrTransactionValidationRequestPayload.toString());
            Detail validateTransactionDetails = iodrApiClientForEncryptionDecryption.validateTransaction(requestId, iodrTransactionValidationRequestPayload);

            System.out.println("Calling validate transaction details API response : " + validateTransactionDetails.toString());

        } catch (Exception e) {
            System.out.println("Validate transaction details API Call failed with error msg " + e);
            Assert.assertNotNull(e);
        }
    }

    @Test
    public void testGetTransactionStatusWithPositiveScenario()  {
        try {
            String trackingNumber = "OUD0AT0UAKDO";
            System.out.println("Calling get transaction status API with trackingNumber : " + trackingNumber);
            Status transactionDetailStatus = iodrApiClientForEncryptionDecryption.getTransactionStatus(trackingNumber);

            System.out.println("Calling get transaction status API response : " + transactionDetailStatus.toString());

        } catch (Exception e) {
            System.out.println("Get transaction status API Call failed with error msg "+e);
            Assert.assertNotNull(e);
        }
    }

    @Test
    public void testGetTransactionStatusWithNegativeScenario()  {
        try {
            String trackingNumber = "OUD0AT0UAKDP";
            System.out.println("Calling get transaction status API with trackingNumber : " + trackingNumber);
            Status transactionDetailStatus = iodrApiClientForEncryptionDecryption.getTransactionStatus(trackingNumber);

            System.out.println("Calling get transaction status API response : " + transactionDetailStatus.toString());

        } catch (Exception e) {
            System.out.println("Get transaction status API Call failed with error msg "+e);
            Assert.assertNotNull(e);
        }
    }

    @Test
    public void testUpdateComplaintsByUserAPIWithPositiveScenario()  {
        try {
            String requestId = UUID.randomUUID().toString();
            UpdateComplaintByUser updateComplaintByUser = getUpdateComplaintByUserRequest();
            System.out.println("Calling update a complaint by issuer API with requestID : "+ requestId+" and request payload :"+ updateComplaintByUser.toString());
            Complaint complaintUpdateByIssuer = iodrApi.updateComplaint(requestId, updateComplaintByUser);

            System.out.println("Calling update a complaint by issuer API response :"+ complaintUpdateByIssuer.toString());

        } catch (Exception e) {
            System.out.println(e);
            Assert.assertNotNull(e);
        }
    }
    @Test
    public void testUpdateComplaintsByUserAPIWithNegativeScenario()  {
        try {
            String requestId = UUID.randomUUID().toString();
            UpdateComplaintByUser updateComplaintByUser = getUpdateComplaintByUserRequest();
            updateComplaintByUser.setTrackingNumber("ABX");
            System.out.println("Calling update a complaint by issuer API with requestID "+ requestId+" and request payload "+updateComplaintByUser);
            Complaint complaintUpdateByIssuer = iodrApi.updateComplaint(requestId, updateComplaintByUser);

            System.out.println("Calling update a complaint by issuer API response :" + complaintUpdateByIssuer.toString());

        } catch (Exception e) {
            System.out.println(e);
            Assert.assertNotNull(e);
        }
    }

    @Test
    public void testFetchComplaintBySerachCriteriaAPIWithPositiveScenario()  {
        try {
            String requestId = UUID.randomUUID().toString();
            FetchComplaintsBySearchCriteria fetchComplaintsBySearchCriteria = getComplaintsBySeachParamRequest();
            System.out.println("Calling get a complaint Details API with requestID : " + requestId + " and request payload : " + fetchComplaintsBySearchCriteria.toString());
            Search complaintSearchResponse = iodrApiClientForEncryptionDecryption.getComplaintsBySearchParam(requestId, fetchComplaintsBySearchCriteria);

            System.out.println("Calling get a complaint Details API response : " + complaintSearchResponse.toString());


        } catch (Exception e) {
            System.out.println(e);
            Assert.assertNotNull(e);
        }
    }

    @Test
    public void testFetchComplaintBySerachCriteriaAPIWithNegativeScenario()  {
        try {
            String requestId = UUID.randomUUID().toString();
            FetchComplaintsBySearchCriteria fetchComplaintsBySearchCriteria = getComplaintsBySeachParamRequest();
            fetchComplaintsBySearchCriteria.setSearchValue("");
            System.out.println("Calling get a complaint Details API with requestID : " + requestId + " and request payload : " + fetchComplaintsBySearchCriteria.toString());
            Search complaintSearchResponse = iodrApiClientForEncryptionDecryption.getComplaintsBySearchParam(requestId, fetchComplaintsBySearchCriteria);

            System.out.println("Calling get a complaint Details API response : " + complaintSearchResponse.toString());

        } catch (Exception e) {
            System.out.println(e);
            Assert.assertNotNull(e);
        }
    }

    private  CreateComplaint getCreateComplaintRequest() {
        CreateComplaint createComplaint = new CreateComplaint();
        createComplaint.setComplaintType(CreateComplaint.ComplaintTypeEnum.ATM);
        createComplaint.setTransactionDate("2025-03-06");
        createComplaint.setCardNumber("530837881010");
        createComplaint.setTransactionAmount("9999.98");
        return createComplaint;
    }

    // Validate Transaction Details API by Issuer Request payload
    private  IODRTransactionValidation getValidateTransactionRequest() {
        IODRTransactionValidation iodrTransactionValidation = new IODRTransactionValidation();

        iodrTransactionValidation.setTrackingNumber("OUD0AT0UAKDO");
        iodrTransactionValidation.setRetrievalReferenceNumber("435465768995");
        iodrTransactionValidation.setBanknetReferenceNumber("234354739");
        iodrTransactionValidation.setApprovalCode("A1R4D8");
        iodrTransactionValidation.setAcquirerICA("00000023162");
        return iodrTransactionValidation;
    }

    // Update Complaint By Issuer or Acquirer API Request payload
    private  UpdateComplaintByUser getUpdateComplaintByUserRequest() {
        UpdateComplaintByUser updateComplaintByIssuer = new UpdateComplaintByUser();
        updateComplaintByIssuer.setComments("Complaint status updated");
        updateComplaintByIssuer.setComplaintStatus(UpdateComplaintByUser.ComplaintStatusEnum.UNDER_INVESTIGATION);
        updateComplaintByIssuer.setTrackingNumber("OUD0AT0UAKDO");
        return updateComplaintByIssuer;
    }

    // Get Complaint Details by Search criteria by Issuer or Acquirer
    private FetchComplaintsBySearchCriteria getComplaintsBySeachParamRequest() {
        FetchComplaintsBySearchCriteria fetchComplaintsBySearchCriteria = new FetchComplaintsBySearchCriteria();
        fetchComplaintsBySearchCriteria.searchType(FetchComplaintsBySearchCriteria.SearchTypeEnum.DEFAULT);
        return fetchComplaintsBySearchCriteria;
    }
}
```

3. Once the project setup is completed, compile and run the project.

Note: You have successfully completed the tutorial on how to generate the SDK and connect to the IODR API in Sandbox using the SDK.

## Encryption and decryption {#encryption-and-decryption}

If the endpoint you are calling requires [encryption or decryption](https://developer.mastercard.com/platform/documentation/security-and-authentication/securing-sensitive-data-using-payload-encryption/), you need to configure an interceptor to encrypt the request payload or decrypt the response body.  

To configure the interceptor, load the certificate:

* create the configuration object for encryption and decryption.

```java
     private  JweConfig getEncryptionDecryptionConfig(String encryptionCertPath, String keyFile, String keyAlias, String password) 
     {
        JweConfig config = null;
        try {
            Certificate encryptionCertificate = EncryptionUtils.loadEncryptionCertificate(encryptionCertPath);
            PrivateKey key = EncryptionUtils.loadDecryptionKey(keyFile, keyAlias, password);
            config = JweConfigBuilder.aJweEncryptionConfig().withEncryptionCertificate(encryptionCertificate)
                    .withEncryptionPath("$", "$").withEncryptedValueFieldName("encryptedValue")
                    .withDecryptionKey(key).withDecryptionPath("$.encryptedValue", "$")
                    .build();
        } catch (Exception e) {
            System.out.println(e);
        }
        return config;
     }
```

* Instantiate `IodrApi` with `getApiClient` with `enabledEncryptionDecryption` as true.

```Java
IodrApi iodrApiClientForEncryptionDecryption = new IodrApi(getApiClient(true));
```

* Use the following method to get the `ApiClient`.

```Java
public  ApiClient getApiClient(boolean enableEncryption) throws Exception 
{
    ApiClient client = new ApiClient();

    String consumerKey = "<Consumer_key from your Mastercard Developer's project>";
    String signingKeyFilePath = "./src/main/resources/client p12 file name downloaded on project creation>.p12";
    String encryptionCertPath = "./src/main/resources/<pem file name downloaded on project creation>.pem";
    String mcKeyFilePath = "./src/main/resources/<mastercard p12 file name downloaded on project creation>.p12";
    String signingKeyAlias = "<key_alias id provided at the time of project creation>";
    String signingKeyPassword = "<key_password provided at the time of project creation>";
    String mcKeyAlias = "<mc_key_alias id provided at the time of project creation>";
    String mcKeyPassword = "<mc_key_password provided at the time of project creation>";
    PrivateKey signingKey = AuthenticationUtils.loadSigningKey(signingKeyFilePath, signingKeyAlias,
            signingKeyPassword);

    client.setBasePath("https://mtf.api.mastercard.co.in/iodr");
    client.setDebugging(true);

    if (enableEncryption) {
        client.setHttpClient(client.getHttpClient().newBuilder()
                .addInterceptor(new OkHttpJweInterceptor(getEncryptionDecryptionConfig(encryptionCertPath,mcKeyFilePath, mcKeyAlias, mcKeyPassword)))
                .addInterceptor(new OkHttpOAuth1Interceptor(consumerKey, signingKey)).build());
    } else {
        client.setHttpClient(client.getHttpClient().newBuilder()
                .addInterceptor(new OkHttpOAuth1Interceptor(consumerKey, signingKey)).build());
    }
    return client;

}
```

### Generate a unique Request-ID {#generate-a-unique-request-id}

The Request-ID header identifies each API request. This helps in tracking and logging failed requests, debug, and trace issues.

Use the UUID class in Java to generate a random UUID.

```java
import java.util.UUID;

public class RequestIdGenerator {
    public static String generateRequestId() {
        return UUID.randomUUID().toString();
    }
}
```

Note: For a walkthrough of the first Sandbox call, see [Make your first Sandbox request](https://developer.mastercard.com/india-online-dispute-resolution/documentation/quick-start-guide/index.md#step-3-make-your-first-sandbox-request).