all done

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

@@ -33,7 +33,7 @@ public class PayPal implements Payment{
 
     @Override
     public String getShortDescription() {
-        return String.format("PayPay %s %s", this.payerName,this.email);
+        return String.format("Paypal %s %s", this.payerName,this.email);
     }
 
     public void setId(long id) {

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

@@ -21,7 +21,7 @@ public class PaymentPresenter {
     }
 
     public String toString(Payment[] payments) {
-       // Arrays.sort(payments);
+        Arrays.sort(payments);
         return stringGenerator(payments);
     }
 

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

@@ -6,6 +6,12 @@ public class PaymentSortByPayer implements Comparator<Payment> {
 
     @Override
     public int compare(Payment payment1, Payment payment2) {
-        return payment1.getShortDescription().compareTo(payment2.getShortDescription());
+        int num =payment1.getPayerName().compareTo(payment2.getPayerName());
+        if(num < 0)
+            return -1;
+        else if(num > 0)
+            return 1;
+        else
+            return 0;
     }
 }

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

@@ -52,7 +52,7 @@ public class PaymentPresenterTest {
     @Test
     public void testToStringById(){
         Payment[] payments = new Payment[2];
-        Payment paypal = new PayPal(4L, "Tamara Mowry", "tamara@mowry.com");
+        Payment paypal = new PayPal(140L, "Tamara Mowry", "tamara@mowry.com");
         Payment check = new Check(81L, "Tia Mowry", "11432543", "134344551");
 
         payments[0] = paypal;