Java: Get Letter Metadata with GetLetterDetailsV2()

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package com.postalmethods.client;
 
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
 
import org.junit.Before;
import org.junit.Test;
 
import com.postalmethods.client.api.GetLetterDetailsV2Response;
import com.postalmethods.client.api.SendLetterV2Response;
 
public class GetLetterDetailsV2Test {
 
    private PostalMethodsClient client;
    private int letterId;
 
    @Before
    public void setUp() {
 
        client = new PostalMethodsClientFactory().build();
 
        // Send a sample letter so we have a letterId to check status on.
        SendLetterV2Response sendResponse = client.sendLetterV2("Junit test letter 1", TestConstants.SAMPLE_LETTER_FILENAME);
        int code = sendResponse.getResult().getCode();
        assertTrue(code > 0 );
        this.letterId = code;
    }
 
 
    @Test
    public void testGetLetterDetails() {
 
        System.out.println("Making call to GetLetterDetailsV2...");
        GetLetterDetailsV2Response response = client.getLetterDetailsV2(letterId);
        System.out.println("Service call completed:\n" + response.getResult().toString());
 
        int code = response.getResult().getCode();
        assertEquals( -3000, code ); // success
 
        System.out.println(response.getLetterDetails().toString());
    }
}