Add changes requested by reviewers

- Fix threeDSInfo field name
- Remove Builder annotation in PaymentThreeDSInfo
- Change PaymentFeeRequest type to percentage

src/main/java/com/mercadopago/resources/payment/Payment.java

@@ -1,5 +1,6 @@
 package com.mercadopago.resources.payment;
 
+import com.google.gson.annotations.SerializedName;
 import com.mercadopago.net.MPResource;
 import java.math.BigDecimal;
 import java.time.OffsetDateTime;
@@ -190,7 +191,8 @@ public class Payment extends MPResource {
   private PaymentMethod paymentMethod;
 
   /** 3DS Info. */
-  private PaymentThreeDSInfo threeDsinfo;
+  @SerializedName("three_dsinfo")
+  private PaymentThreeDSInfo threeDSInfo;
 
   /**
    * Internal data that can be attached to the payment to record additional attributes of the

src/main/java/com/mercadopago/resources/payment/PaymentThreeDSInfo.java

@@ -1,15 +1,13 @@
 package com.mercadopago.resources.payment;
 
-import lombok.Builder;
 import lombok.Getter;
 
 /** 3DS Info. */
 @Getter
-@Builder
 public class PaymentThreeDSInfo {
   /** External Resource Url. */
-  private final String externalResourceUrl;
+  private String externalResourceUrl;
 
   /** creq. */
-  private final String creq;
+  private String creq;
 }

src/test/java/com/mercadopago/client/payment/PaymentClientIT.java

@@ -432,10 +432,10 @@ private PaymentCreateRequest newPayment(String paymentStatus) throws MPException
             .build();
 
     PaymentFeeRequest fine =
-        PaymentFeeRequest.builder().type("fixed").value(new BigDecimal(2)).build();
+        PaymentFeeRequest.builder().type("percentage").value(new BigDecimal(2)).build();
 
     PaymentFeeRequest interest =
-        PaymentFeeRequest.builder().type("fixed").value(new BigDecimal("0.03")).build();
+        PaymentFeeRequest.builder().type("percentage").value(new BigDecimal("0.03")).build();
 
     PaymentDiscountRequest discount =
         PaymentDiscountRequest.builder()

src/test/java/com/mercadopago/client/payment/PaymentClientTest.java

@@ -105,10 +105,10 @@ public void createWithThreeDSecureSuccess() throws MPException, IOException, MPA
     assertNotNull(payment.getResponse());
     assertEquals(CREATED, payment.getResponse().getStatusCode());
     assertEquals(
-        payment.getThreeDsinfo().getCreq(),
+        payment.getThreeDSInfo().getCreq(),
         "eyJ0aHJlZURTU2VydmVyVHJhbnNJRCI6ImE4NDQ1NTE2LThjNzktNGQ1NC04MjRmLTU5YzgzNDRiY2FjNCIsImFj");
     assertEquals(
-        payment.getThreeDsinfo().getExternalResourceUrl(),
+        payment.getThreeDSInfo().getExternalResourceUrl(),
         "https://acs-public.tp.mastercard.com/api/v1/browser_challenges");
   }