diff --git a/gateway/builders/payment_data_builder.py b/gateway/builders/payment_data_builder.py
index 55d2c6d..389f517 100644
--- a/gateway/builders/payment_data_builder.py
+++ b/gateway/builders/payment_data_builder.py
@@ -252,6 +252,17 @@ def add_external_token_eci(self, eci=None):
             new_dict={self.__data_sets.PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_ECI: eci}
         )
 
+    def add_external_token_cavv(self, cavv=None):
+        """Add CAVV from decrypted token's data."""
+
+        self.__setup_external_token_data()
+        self.__data_structure_util.add_to_dict(
+            source_dict=self.__payment_data_structure[self.__PAYMENT_METHOD_DATA_KEY],
+            working_dict=self.__external_token_data_structure,
+            new_key=self.__EXTERNAL_TOKEN_DATA_KEY,
+            new_dict={self.__data_sets.PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_CAVV: cavv}
+        )
+
     def add_external_token_trans_status(self, trans_status=None):
         """
         Add transStatus from decrypted token's data
diff --git a/gateway/data_sets/request_parameters.py b/gateway/data_sets/request_parameters.py
index e8950a4..5ef0d61 100644
--- a/gateway/data_sets/request_parameters.py
+++ b/gateway/data_sets/request_parameters.py
@@ -90,6 +90,7 @@ class RequestParameters:
     PAYMENT_METHOD_DATA_EXTERNAL_MPI_TRANS_STATUS = 'transStatus'
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_CRYPTOGRAM = 'cryptogram'
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_ECI = 'eci'
+    PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_CAVV = 'cavv'
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_TRANS_STATUS = 'transStatus'
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_DS_TRANS_ID = 'dsTransID'
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_ACS_TRANS_ID = 'acsTransID'
@@ -191,6 +192,7 @@ class RequestParametersTypes(RequestParameters):
     PAYMENT_METHOD_DATA_EXTERNAL_MPI_TRANS_STATUS = str
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_CRYPTOGRAM = str
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_ECI = str
+    PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_CAVV = str
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_TRANS_STATUS = str
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_DS_TRANS_ID = str
     PAYMENT_METHOD_DATA_EXTERNAL_TOKEN_ACS_TRANS_ID = str
diff --git a/tests/builders/test_payment_data_builder.py b/tests/builders/test_payment_data_builder.py
index b3318a8..33323ee 100644
--- a/tests/builders/test_payment_data_builder.py
+++ b/tests/builders/test_payment_data_builder.py
@@ -77,6 +77,7 @@ def test_additional_data_fields(self):
 
         new.add_external_token_cryptogram('AAMI/uGZvlKCygBkcQIlLJeBTPLG')
         new.add_external_token_eci('07')
+        new.add_external_token_cavv('token-cavv')
         new.add_external_token_trans_status('N')
         new.add_external_token_ds_trans_id('33321368-1c3d-4f3c-ba34-2efb76644c320')
         new.add_external_token_acs_trans_id('99921368-1c3d-4f3c-ba34-2efb76644c320')
@@ -105,6 +106,7 @@ def test_additional_data_fields(self):
                 'external-token-data': {
                     'cryptogram': 'AAMI/uGZvlKCygBkcQIlLJeBTPLG',
                     'eci': '07',
+                    'cavv': 'token-cavv',
                     'cardHolderAuthenticated': True,
                     'transStatus': 'N',
                     'dsTransID': '33321368-1c3d-4f3c-ba34-2efb76644c320',