add comments and fix access modifiers

src/main/java/com/mercadopago/client/payment/PaymentInvoicePeriodRequest.java

@@ -1,11 +1,13 @@
 package com.mercadopago.client.payment;
 
+import lombok.Builder;
 import lombok.Getter;
-import lombok.experimental.SuperBuilder;
 
 @Getter
-@SuperBuilder
+@Builder
 public class PaymentInvoicePeriodRequest {
+  /** Period. */
   private int period;
+  /** Type. */
   private String type;
 }

src/main/java/com/mercadopago/client/payment/PaymentPaymentReferenceRequest.java

@@ -6,5 +6,6 @@
 @Getter
 @Builder
 public class PaymentPaymentReferenceRequest {
+  /** Payment ID reference. */
   private String id;
 }

src/main/java/com/mercadopago/client/payment/PaymentPointOfInteractionRequest.java

@@ -12,7 +12,7 @@ public class PaymentPointOfInteractionRequest {
 
   /** Type. */
   private final String type;
-
+  /**  Transaction data. */
   private final PaymentTransactionDataRequest transactionData;
 
 }

src/main/java/com/mercadopago/client/payment/PaymentSubscriptionSequenceRequest.java

@@ -6,6 +6,8 @@
 @Getter
 @Builder
 public class PaymentSubscriptionSequenceRequest {
+  /** Number. */
   private int number;
+  /** Total. */
   private int total;
 }

src/main/java/com/mercadopago/client/payment/PaymentTransactionDataRequest.java

@@ -6,10 +6,16 @@
 @Getter
 @Builder
 public class PaymentTransactionDataRequest {
+  /** First time use. */
   private boolean firstTimeUse;
+  /**  Subscription sequence. */
   private PaymentSubscriptionSequenceRequest subscriptionSequence;
+  /** Subscription id. */
   private String subscriptionId;
+  /**  Invoice period. */
   private PaymentInvoicePeriodRequest invoicePeriod;
+  /** Payment reference. */
   private PaymentPaymentReferenceRequest paymentReference;
+  /** Billing date. */
   private String billingDate;
 }

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

@@ -6,8 +6,8 @@
 public class PaymentInvoicePeriod {
 
   /** Period. */
-  public int period;
+  private int period;
 
   /** Type. */
-  public String type;
+  private String type;
 }

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

@@ -1,5 +1,6 @@
 package com.mercadopago.resources.payment;
 
 public class PaymentPaymentReference {
-  public String id;
+  /** Payment ID reference. */
+  private String id;
 }

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

@@ -1,6 +1,5 @@
 package com.mercadopago.resources.payment;
 
-import com.mercadopago.client.payment.PaymentSubscriptionSequenceRequest;
 import lombok.Getter;
 
 /** PaymentTransactionData class. */