almost there

src/main/java/com/zipcoder/payment/Check.java

     public String getShortDescription() {
 
 
-        return "Check" + getPayerName() + " " + "***" + getAccountNumber().substring(accountNumber.length() - 4, accountNumber.length() - 1);
+        return "Check" + " "+ getPayerName() + " " + "***" + getAccountNumber().substring(accountNumber.length() - 4, accountNumber.length());
     }
 
     public int compareTo(Payment o) {

src/main/java/com/zipcoder/payment/PayPal.java

     private String payerName;
     private String email;
 
+    public PayPal(){};
+
+    public PayPal(long id, String payerName, String email){
+        this.id = id;
+        this.payerName = payerName;
+        this.email = email;
+    }
+
     public Long getId() {
         return this.id;
     }
 
     public String getShortDescription() {
 
-        return "PayPal" + getPayerName() + " " + getEmail();
+        return "PayPal" + " " + getPayerName() + " " + getEmail();
     }
 
     public int compareTo(Payment o) {

src/main/java/com/zipcoder/payment/PaymentPresenter.java

 package com.zipcoder.payment;
 
+import java.util.Arrays;
+
 public class PaymentPresenter {
 
+    private  Payment payment;
+    private int n;
+    public String toString(Payment[] payments){
+        if(payments.length == 0) {
+
+            return "";
+        }
+        else {
+
+
+            Arrays.sort(payments, new PaymentSortByDescription());
+            StringBuilder sb = new StringBuilder();
+            for (Payment p : payments) {
+                System.out.println(p.getShortDescription());
+                sb.append(p.getShortDescription() + "\n");
+            }
+
+            return sb.toString();
+
+        }
+
+    }
 
 }

src/main/java/com/zipcoder/payment/PaymentSortByDescription.java

+package com.zipcoder.payment;
+
+import java.util.Comparator;
+
+public class PaymentSortByDescription implements Comparator<Payment> {
+
+    public int compare(Payment o1, Payment o2) {
+        int n = o1.getShortDescription().compareTo(o2.getShortDescription());
+        return n;
+
+    }
+}

src/test/java/com/zipcoder/payment/PaymentPresenterTest.java

 package com.zipcoder.payment;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class PaymentPresenterTest {
+
+    @Test
+    public void toStringNoPaymentTest(){
+        Payment[] payments = new Payment[0];
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "";
+
+        String actual = presenter.toString(payments);
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void toStringHasPaymentTest() {
+        Payment[] payments = new Payment[2];
+        Payment paypal = new PayPal(4L, "Tia Mowry", "tia@mowry.com");
+        Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551");
+
+        payments[0] = paypal;
+        payments[1] = check;
+
+        PaymentPresenter presenter = new PaymentPresenter();
+        String expected = "Check Tia Mowry ***4551\nPayPal Tia Mowry tia@mowry.com\n";
+
+        String actual = presenter.toString(payments);
+        Assert.assertEquals(expected, actual);
+
+    }
 }