diff --git a/src/RapidDirectGateway.php b/src/RapidDirectGateway.php
index 28cfce7..de54098 100644
--- a/src/RapidDirectGateway.php
+++ b/src/RapidDirectGateway.php
@@ -135,6 +135,9 @@ public function setPassword($value)
      */
     public function purchase(array $parameters = [])
     {
+        if (is_array($parameters['card']) && isset($parameters['card']['number']) && substr($parameters['card']['number'], 0, 9) ===  'eCrypted:') {
+            $parameters['encryptedCardNumber'] = $parameters['card']['number'];
+        }
         return $this->createRequest('\Omnipay\Eway\Message\RapidDirectPurchaseRequest', $parameters);
     }
 
@@ -152,6 +155,9 @@ public function purchase(array $parameters = [])
      */
     public function authorize(array $parameters = [])
     {
+        if (isset($parameters['card']['number']) && substr($parameters['card']['number'], 0, 9) ===  'eCrypted:') {
+            $parameters['encryptedCardNumber'] = $parameters['card']['number'];
+        }
         return $this->createRequest('\Omnipay\Eway\Message\RapidDirectAuthorizeRequest', $parameters);
     }