diff --git a/fineract-avro-schemas/src/main/avro/loan/v1/LoanRepaymentDueDataV1.avsc b/fineract-avro-schemas/src/main/avro/loan/v1/LoanRepaymentDueDataV1.avsc
index 87efc7499..add6a9056 100644
--- a/fineract-avro-schemas/src/main/avro/loan/v1/LoanRepaymentDueDataV1.avsc
+++ b/fineract-avro-schemas/src/main/avro/loan/v1/LoanRepaymentDueDataV1.avsc
@@ -38,6 +38,17 @@
                 "null",
                 "org.apache.fineract.avro.loan.v1.RepaymentPastDueDataV1"
             ]
+        },
+        {
+            "default": null,
+            "name": "customData",
+            "type": [
+                "null",
+                {
+                    "values": "bytes",
+                    "type": "map"
+                }
+            ]
         }
     ]
 }
diff --git a/fineract-provider/src/main/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializer.java b/fineract-provider/src/main/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializer.java
index 84ad31b05..5050512d7 100644
--- a/fineract-provider/src/main/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializer.java
+++ b/fineract-provider/src/main/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializer.java
@@ -19,6 +19,7 @@
 package org.apache.fineract.infrastructure.event.external.service.serialization.serializer.loan;
 
 import java.math.BigDecimal;
+import java.util.List;
 import lombok.RequiredArgsConstructor;
 import org.apache.avro.generic.GenericContainer;
 import org.apache.fineract.avro.generator.ByteBufferSerializable;
@@ -30,7 +31,8 @@ import org.apache.fineract.infrastructure.event.business.domain.BusinessEvent;
 import org.apache.fineract.infrastructure.event.business.domain.loan.repayment.LoanRepaymentBusinessEvent;
 import org.apache.fineract.infrastructure.event.external.service.serialization.mapper.loan.LoanRepaymentPastDueDataMapper;
 import org.apache.fineract.infrastructure.event.external.service.serialization.mapper.support.AvroDateTimeMapper;
-import org.apache.fineract.infrastructure.event.external.service.serialization.serializer.BusinessEventSerializer;
+import org.apache.fineract.infrastructure.event.external.service.serialization.serializer.AbstractBusinessEventWithCustomDataSerializer;
+import org.apache.fineract.infrastructure.event.external.service.serialization.serializer.ExternalEventCustomDataSerializer;
 import org.apache.fineract.organisation.monetary.domain.MonetaryCurrency;
 import org.apache.fineract.portfolio.loanaccount.data.LoanRepaymentPastDueData;
 import org.apache.fineract.portfolio.loanaccount.domain.Loan;
@@ -40,11 +42,12 @@ import org.springframework.stereotype.Component;
 
 @Component
 @RequiredArgsConstructor
-public class LoanRepaymentBusinessEventSerializer implements BusinessEventSerializer {
+public class LoanRepaymentBusinessEventSerializer extends AbstractBusinessEventWithCustomDataSerializer<LoanRepaymentBusinessEvent> {
 
     private final AvroDateTimeMapper dataTimeMapper;
     private final LoanRepaymentPastDueDataMapper pastDueDataMapper;
     private final LoanCalculateRepaymentPastDueService pastDueService;
+    private final List<ExternalEventCustomDataSerializer<LoanRepaymentBusinessEvent>> externalEventCustomDataSerializers;
 
     @Override
     public <T> ByteBufferSerializable toAvroDTO(BusinessEvent<T> rawEvent) {
@@ -68,6 +71,7 @@ public class LoanRepaymentBusinessEventSerializer implements BusinessEventSerial
 
         LoanRepaymentDueDataV1 loanRepaymentDueDataV1 = LoanRepaymentDueDataV1.newBuilder().setLoanId(id).setLoanAccountNo(accountNo)
                 .setLoanExternalId(externalId).setCurrency(currency).setInstallment(repaymentDue).setPastDueAmount(pastDue).build();
+        loanRepaymentDueDataV1.setCustomData(collectCustomData(event));
         return loanRepaymentDueDataV1;
     }
 
@@ -94,4 +98,9 @@ public class LoanRepaymentBusinessEventSerializer implements BusinessEventSerial
     public Class<? extends GenericContainer> getSupportedSchema() {
         return LoanRepaymentDueDataV1.class;
     }
+
+    @Override
+    protected List<ExternalEventCustomDataSerializer<LoanRepaymentBusinessEvent>> getExternalEventCustomDataSerializers() {
+        return externalEventCustomDataSerializers;
+    }
 }
diff --git a/fineract-provider/src/test/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializerTest.java b/fineract-provider/src/test/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializerTest.java
index 66af9aa8a..c6a82ef44 100644
--- a/fineract-provider/src/test/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializerTest.java
+++ b/fineract-provider/src/test/java/org/apache/fineract/infrastructure/event/external/service/serialization/serializer/loan/LoanRepaymentBusinessEventSerializerTest.java
@@ -18,7 +18,9 @@
  */
 package org.apache.fineract.infrastructure.event.external.service.serialization.serializer.loan;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
@@ -28,11 +30,13 @@ import java.io.IOException;
 import java.math.BigDecimal;
 import java.math.MathContext;
 import java.math.RoundingMode;
+import java.nio.ByteBuffer;
 import java.time.LocalDate;
 import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import org.apache.avro.AvroRuntimeException;
 import org.apache.fineract.avro.generic.v1.CurrencyDataV1;
@@ -45,9 +49,11 @@ import org.apache.fineract.infrastructure.core.domain.FineractPlatformTenant;
 import org.apache.fineract.infrastructure.core.service.DateUtils;
 import org.apache.fineract.infrastructure.core.service.ExternalIdFactory;
 import org.apache.fineract.infrastructure.core.service.ThreadLocalContextUtil;
+import org.apache.fineract.infrastructure.event.business.domain.loan.repayment.LoanRepaymentBusinessEvent;
 import org.apache.fineract.infrastructure.event.business.domain.loan.repayment.LoanRepaymentDueBusinessEvent;
 import org.apache.fineract.infrastructure.event.external.service.serialization.mapper.loan.LoanRepaymentPastDueDataMapper;
 import org.apache.fineract.infrastructure.event.external.service.serialization.mapper.support.AvroDateTimeMapper;
+import org.apache.fineract.infrastructure.event.external.service.serialization.serializer.ExternalEventCustomDataSerializer;
 import org.apache.fineract.organisation.monetary.domain.MonetaryCurrency;
 import org.apache.fineract.organisation.monetary.domain.MoneyHelper;
 import org.apache.fineract.portfolio.loanaccount.domain.Loan;
@@ -80,6 +86,8 @@ public class LoanRepaymentBusinessEventSerializerTest {
 
     private MockedStatic<MoneyHelper> moneyHelper = Mockito.mockStatic(MoneyHelper.class);
 
+    private static final String CUSTOM_DATA_PREFIX = "test_data_loan_repayment_business_event";
+
     @BeforeEach
     public void setUp() {
         ThreadLocalContextUtil.setTenant(new FineractPlatformTenant(1L, "default", "Default", "Asia/Kolkata", null));
@@ -100,7 +108,7 @@ public class LoanRepaymentBusinessEventSerializerTest {
     public void testLoanRepaymentEventPayloadSerialization() throws IOException {
         // given
         LoanRepaymentBusinessEventSerializer serializer = new LoanRepaymentBusinessEventSerializer(mapper, pastDueDataMapper,
-                pastDueService);
+                pastDueService, createCustomDataForEvents());
 
         LocalDate loanInstallmentRepaymentDueDate = DateUtils.getBusinessLocalDate().plusDays(1);
 
@@ -137,17 +145,21 @@ public class LoanRepaymentBusinessEventSerializerTest {
         RepaymentPastDueDataV1 pastDue = new RepaymentPastDueDataV1(BigDecimal.valueOf(0.0), BigDecimal.valueOf(0.0),
                 BigDecimal.valueOf(0.0), BigDecimal.valueOf(0.0), BigDecimal.valueOf(0.0));
         LoanRepaymentDueDataV1 expectedSerializedData = new LoanRepaymentDueDataV1(1L, "0001", "externalId", currency, repaymentDue,
-                pastDue);
+                pastDue, data.getCustomData());
 
         assertEquals(data, expectedSerializedData);
 
+        assertNotNull(data.getCustomData());
+        final Map<String, ByteBuffer> customData = data.getCustomData();
+        assertEquals(CUSTOM_DATA_PREFIX + "_1", new String(customData.get("test_key_1").array(), UTF_8));
+        assertEquals(CUSTOM_DATA_PREFIX + "_2", new String(customData.get("test_key_2").array(), UTF_8));
     }
 
     @Test
     public void testLoanRepaymentEventLoanIdMandatoryFieldValidation() {
         // given
         LoanRepaymentBusinessEventSerializer serializer = new LoanRepaymentBusinessEventSerializer(mapper, pastDueDataMapper,
-                pastDueService);
+                pastDueService, createCustomDataForEvents());
 
         LocalDate loanInstallmentRepaymentDueDate = DateUtils.getBusinessLocalDate().plusDays(1);
 
@@ -178,4 +190,41 @@ public class LoanRepaymentBusinessEventSerializerTest {
         AvroRuntimeException exceptionThrown = assertThrows(AvroRuntimeException.class, () -> serializer.toAvroDTO(event));
         assertTrue(exceptionThrown.getMessage().contains("does not accept null values"));
     }
+
+    private List<ExternalEventCustomDataSerializer<LoanRepaymentBusinessEvent>> createCustomDataForEvents() {
+        return List.of(new ExternalEventCustomDataSerializer<>() {
+
+            @Override
+            public ByteBuffer serialize(final LoanRepaymentBusinessEvent event) {
+                return ByteBuffer.wrap(CUSTOM_DATA_PREFIX.getBytes(UTF_8));
+            }
+
+            @Override
+            public String key() {
+                return "test_key_1";
+            }
+        }, new ExternalEventCustomDataSerializer<>() {
+
+            @Override
+            public ByteBuffer serialize(final LoanRepaymentBusinessEvent event) {
+                return ByteBuffer.wrap((CUSTOM_DATA_PREFIX + "_1").getBytes(UTF_8));
+            }
+
+            @Override
+            public String key() {
+                return "test_key_1";
+            }
+        }, new ExternalEventCustomDataSerializer<>() {
+
+            @Override
+            public ByteBuffer serialize(final LoanRepaymentBusinessEvent event) {
+                return ByteBuffer.wrap((CUSTOM_DATA_PREFIX + "_2").getBytes(UTF_8));
+            }
+
+            @Override
+            public String key() {
+                return "test_key_2";
+            }
+        });
+    }
 }