diff --git a/composer.json b/composer.json
index 053ac57..ab00b23 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,8 @@
         "omnipay/common": "~3.0"
     },
     "require-dev": {
-        "omnipay/tests": "~3.0"
+        "omnipay/tests": "~3.0",
+        "squizlabs/php_codesniffer": "^3.2"
     },
     "extra": {
         "branch-alias": {
diff --git a/src/Message/PxPayAuthorizeRequest.php b/src/Message/PxPayAuthorizeRequest.php
index a9f44d5..0d9f7fa 100644
--- a/src/Message/PxPayAuthorizeRequest.php
+++ b/src/Message/PxPayAuthorizeRequest.php
@@ -177,6 +177,30 @@ public function setTransactionData3($value)
         return $this->setParameter('transactionData3', $value);
     }
 
+    /**
+     * Get the PxPay BillingId where this is used instead of the DpsBillingId
+     * for storing or retrieving a saved card profile.
+     *
+     * @see getCardReference() for DpsBillingId
+     * @return mixed
+     */
+    public function getBillingId()
+    {
+        return $this->getParameter('billingId');
+    }
+
+    /**
+     * Set a BillingId for use of a stored card with a local reference as an
+     * alternative to using cardReference (which uses DPS' generated reference instead)
+     *
+     * @param string $value Max 32 bytes
+     * @return $this
+     */
+    public function setBillingId($value)
+    {
+        return $this->setParameter('billingId', $value);
+    }
+
     /**
      * Get the transaction data
      *
@@ -217,6 +241,8 @@ public function getData()
 
         if ($this->getCardReference()) {
             $data->DpsBillingId = $this->getCardReference();
+        } elseif ($this->getBillingId()) {
+            $data->BillingId = $this->getBillingId();
         }
 
         return $data;
@@ -230,7 +256,7 @@ public function getData()
      */
     public function sendData($data)
     {
-        $httpResponse = $this->httpClient->request('POST' ,$this->getEndpoint(), [], $data->asXML());
+        $httpResponse = $this->httpClient->request('POST', $this->getEndpoint(), [], $data->asXML());
 
         return $this->createResponse($httpResponse->getBody()->getContents());
     }
diff --git a/src/Message/PxPostAuthorizeRequest.php b/src/Message/PxPostAuthorizeRequest.php
index 7ef9397..1514bdd 100644
--- a/src/Message/PxPostAuthorizeRequest.php
+++ b/src/Message/PxPostAuthorizeRequest.php
@@ -132,6 +132,30 @@ public function setTransactionData3($value)
         return $this->setParameter('transactionData3', $value);
     }
 
+    /**
+     * Get the PxPost BillingId where this is used instead of the DpsBillingId
+     * for storing or retrieving a saved card profile.
+     *
+     * @see getCardReference() for DpsBillingId
+     * @return mixed
+     */
+    public function getBillingId()
+    {
+        return $this->getParameter('billingId');
+    }
+
+    /**
+     * Set a BillingId for use of a stored card with a local reference as an
+     * alternative to using cardReference (which uses DPS' generated reference instead)
+     *
+     * @param string $value Max 32 bytes
+     * @return $this
+     */
+    public function setBillingId($value)
+    {
+        return $this->setParameter('billingId', $value);
+    }
+
     protected function getBaseData()
     {
         $data = new \SimpleXMLElement('<Txn />');
@@ -172,6 +196,8 @@ public function getData()
 
         if ($this->getCardReference()) {
             $data->DpsBillingId = $this->getCardReference();
+        } elseif ($this->getBillingId()) {
+            $data->BillingId = $this->getBillingId();
         } elseif ($this->getCard()) {
             $this->getCard()->validate();
             $data->CardNumber = $this->getCard()->getNumber();