diff --git a/src/main/java/com/mangopay/core/deserializer/PayInDeserializer.java b/src/main/java/com/mangopay/core/deserializer/PayInDeserializer.java
index e692170c..2e8f000c 100644
--- a/src/main/java/com/mangopay/core/deserializer/PayInDeserializer.java
+++ b/src/main/java/com/mangopay/core/deserializer/PayInDeserializer.java
@@ -72,6 +72,9 @@ public PayIn deserialize(JsonElement json, Type typeOfT, JsonDeserializationCont
                 if (object.has("ShippingPreference") && !object.get("ShippingPreference").isJsonNull()) {
                     payInPaymentDetailsPayPal.setShippingPreference(ShippingPreference.valueOf(object.get("ShippingPreference").getAsString()));
                 }
+                if (object.has("Reference") && !object.get("Reference").isJsonNull()) {
+                    payInPaymentDetailsPayPal.setReference(object.get("Reference").getAsString());
+                }
                 payIn.setPaymentDetails(payInPaymentDetailsPayPal);
                 break;
             case PAYCONIQ:
diff --git a/src/main/java/com/mangopay/core/serializer/PayInSerializer.java b/src/main/java/com/mangopay/core/serializer/PayInSerializer.java
index 26ae3d9d..c03608c3 100644
--- a/src/main/java/com/mangopay/core/serializer/PayInSerializer.java
+++ b/src/main/java/com/mangopay/core/serializer/PayInSerializer.java
@@ -47,6 +47,7 @@ public JsonElement serialize(PayIn src, Type typeOfSrc, JsonSerializationContext
                 object.add("Shipping", context.serialize(((PayInPaymentDetailsPayPal) src.getPaymentDetails()).getShipping()));
                 object.add("LineItems", context.serialize(((PayInPaymentDetailsPayPal) src.getPaymentDetails()).getLineItems()));
                 object.add("ShippingPreference", context.serialize(((PayInPaymentDetailsPayPal) src.getPaymentDetails()).getShippingPreference()));
+                object.add("Reference", context.serialize(((PayInPaymentDetailsPayPal) src.getPaymentDetails()).getReference()));
                 break;
             case "PayInPaymentDetailsPayconiq":
                 object.add("Country", context.serialize(((PayInPaymentDetailsPayconiq) src.getPaymentDetails()).getCountry()));
diff --git a/src/main/java/com/mangopay/entities/Refund.java b/src/main/java/com/mangopay/entities/Refund.java
index 71810ca5..f16a9496 100644
--- a/src/main/java/com/mangopay/entities/Refund.java
+++ b/src/main/java/com/mangopay/entities/Refund.java
@@ -43,6 +43,9 @@ public class Refund extends Transaction {
     @SerializedName("RefundReason")
     private RefundReason refundReason;
 
+    @SerializedName("Reference")
+    private String reference;
+
     public String getInitialTransactionId() {
         return initialTransactionId;
     }
@@ -83,6 +86,14 @@ public void setRefundReason(com.mangopay.core.RefundReason refundReason) {
         this.refundReason = refundReason;
     }
 
+    public String getReference() {
+        return reference;
+    }
+
+    public void setReference(String reference) {
+        this.reference = reference;
+    }
+
     /**
      * Gets map which property is an object and what type of object.
      *
diff --git a/src/main/java/com/mangopay/entities/subentities/PayInPaymentDetailsPayPal.java b/src/main/java/com/mangopay/entities/subentities/PayInPaymentDetailsPayPal.java
index 78859273..3bb907fe 100644
--- a/src/main/java/com/mangopay/entities/subentities/PayInPaymentDetailsPayPal.java
+++ b/src/main/java/com/mangopay/entities/subentities/PayInPaymentDetailsPayPal.java
@@ -43,6 +43,9 @@ public class PayInPaymentDetailsPayPal extends Dto implements PayInPaymentDetail
     @SerializedName("ShippingPreference")
     private ShippingPreference shippingPreference;
 
+    @SerializedName("Reference")
+    private String reference;
+
     public ShippingAddress getShippingAddress() {
         return shippingAddress;
     }
@@ -104,4 +107,12 @@ public ShippingPreference getShippingPreference() {
     public void setShippingPreference(ShippingPreference shippingPreference) {
         this.shippingPreference = shippingPreference;
     }
+
+    public String getReference() {
+        return reference;
+    }
+
+    public void setReference(String reference) {
+        this.reference = reference;
+    }
 }
diff --git a/src/main/resources/com/mangopay/core/mangopay.properties b/src/main/resources/com/mangopay/core/mangopay.properties
index bd497d4b..8ca131fa 100644
--- a/src/main/resources/com/mangopay/core/mangopay.properties
+++ b/src/main/resources/com/mangopay/core/mangopay.properties
@@ -1,2 +1,2 @@
-#Fri Sep 29 15:15:35 EEST 2023
+#Wed Oct 18 10:44:26 EEST 2023
 version=2.31.0
diff --git a/src/test/java/com/mangopay/core/BaseTest.java b/src/test/java/com/mangopay/core/BaseTest.java
index 005d1c3e..3bc44e69 100644
--- a/src/test/java/com/mangopay/core/BaseTest.java
+++ b/src/test/java/com/mangopay/core/BaseTest.java
@@ -997,6 +997,7 @@ protected Refund getNewRefundForPayIn(PayIn payIn) throws Exception {
         refund.setFees(new Money());
         refund.getFees().setAmount(payIn.getFees().getAmount());
         refund.getFees().setCurrency(payIn.getFees().getCurrency());
+        refund.setReference("Reference");
 
         return this.api.getPayInApi().createRefund(payIn.getId(), refund);
     }
diff --git a/src/test/java/com/mangopay/core/PayInApiImplTest.java b/src/test/java/com/mangopay/core/PayInApiImplTest.java
index 4e1a4992..2d4962ed 100644
--- a/src/test/java/com/mangopay/core/PayInApiImplTest.java
+++ b/src/test/java/com/mangopay/core/PayInApiImplTest.java
@@ -567,6 +567,7 @@ public void createPayPalWebV2() throws Exception {
         ));
         paymentDetails.setLineItems(lineItems);
         paymentDetails.setShippingPreference(ShippingPreference.GET_FROM_FILE);
+        paymentDetails.setReference("Reference");
         paymentDetails.setStatementDescriptor("sttm");
 
         payIn.setPaymentDetails(paymentDetails);