diff --git a/src/Client.php b/src/Client.php
index eec03b9..d738ee5 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -40,6 +40,17 @@
  */
 class Client extends GuzzleClient
 {
+    /**
+     * @var array
+     */
+    private $marketoObjects = array(
+      'Leads' => 'leads',
+      'Companies' => 'companies',
+      'Opportunities' => 'opportunities',
+      'Opportunities Roles' => 'opportunities/roles',
+      'Sales Persons' => 'salespersons'
+    );
+
     /**
      * {@inheritdoc}
      */
@@ -192,6 +203,135 @@ private function createOrUpdateLeadsCommand($action, $leads, $lookupField, $args
         return $this->getResult('createOrUpdateLeads', $args, false, $returnRaw);
     }
 
+    /**
+     * Only update the given opportunities.
+     *
+     * @param array       $opportunities Array of arrays.
+     * @param string      $dedupeBy
+     * @param array       $args
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Opportunities/syncOpportunitiesUsingPOST
+     *
+     * @return GetLeadsResponse
+     */
+    public function updateOpportunities($opportunities, $dedupeBy = 'dedupeFields', $args = array(), $returnRaw = false) {
+        return $this->createOrUpdateObjects('Opportunities', 'updateOnly', $opportunities, $dedupeBy, $args, $returnRaw);
+    }
+
+    /**
+     * Only create the given opportunities.
+     *
+     * @param array       $opportunities Array of arrays.
+     * @param string      $dedupeBy
+     * @param array       $args
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Opportunities/syncOpportunitiesUsingPOST
+     *
+     * @return GetLeadsResponse
+     */
+    public function createOpportunities($opportunities, $dedupeBy = 'dedupeFields', $args = array(), $returnRaw = false) {
+        return $this->createOrUpdateObjects('Opportunities', 'createOnly', $opportunities, $dedupeBy, $args, $returnRaw);
+    }
+
+    /**
+     * Create or update the given opportunities.
+     *
+     * @param array        $opportunities Array of arrays.
+     * @param string       $dedupeBy
+     * @param array        $args
+     * @param bool|false   $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Opportunities/syncOpportunitiesUsingPOST
+     *
+     * @return GetLeadsResponse
+     */
+    public function createOrUpdateOpportunities($opportunities, $dedupeBy = 'dedupeFields', $args = array(), $returnRaw = false) {
+        return $this->createOrUpdateObjects('Opportunities', 'createOrUpdate', $opportunities, $dedupeBy, $args, $returnRaw);
+    }
+
+    /**
+     * Only update the given companies.
+     *
+     * @param array       $companies Array of arrays.
+     * @param string      $dedupeBy
+     * @param array       $args
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Companies/syncCompaniesUsingPOST
+     *
+     * @return GetLeadsResponse
+     */
+    public function updateCompanies($companies, $dedupeBy = 'dedupeFields', $args = array(), $returnRaw = false) {
+        return $this->createOrUpdateObjects('Companies', 'updateOnly', $companies, $dedupeBy, $args, $returnRaw);
+    }
+
+    /**
+     * Only create the given companies.
+     *
+     * @param array       $companies Array of arrays.
+     * @param string      $dedupeBy
+     * @param array       $args
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Companies/syncCompaniesUsingPOST
+     *
+     * @return GetLeadsResponse
+     */
+    public function createCompanies($companies, $dedupeBy = 'dedupeFields', $args = array(), $returnRaw = false) {
+        return $this->createOrUpdateObjects('Companies', 'createOnly', $companies, $dedupeBy, $args, $returnRaw);
+    }
+
+    /**
+     * Create or update the given companies.
+     *
+     * @param array        $companies Array of arrays.
+     * @param string       $dedupeBy
+     * @param array        $args
+     * @param bool|false   $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Companies/syncCompaniesUsingPOST
+     *
+     * @return GetLeadsResponse
+     */
+    public function createOrUpdateCompanies($companies, $dedupeBy = 'dedupeFields', $args = array(), $returnRaw = false) {
+        return $this->createOrUpdateObjects('Companies', 'createOrUpdate', $companies, $dedupeBy, $args, $returnRaw);
+    }
+
+    /**
+     * Generic method to create or update Marketo objects.
+     *
+     * @param string      $objectName
+     * @param string      $action     Should be createOnly, updateOnly, or createOrUpdate.
+     * @param array       $records    Array of arrays.
+     * @param string      $dedupeBy
+     * @param array       $args
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @return GetLeadsResponse
+
+     */
+    private function createOrUpdateObjects($objectName, $action, $records, $dedupeBy, $args = array(), $returnRaw = false) {
+        if (!isset($this->marketoObjects[$objectName])) {
+            throw new \Exception('createOrUpdate() Expected parameter $objectName, to be a valid Marketo object '  . "but $objectName provided");
+        };
+
+        $args['objectName'] = $this->marketoObjects[$objectName];
+        $args['action'] = $action;
+        $args['input'] = $records;
+        $args['dedupeBy'] = $dedupeBy;
+
+        return $this->getResult('createOrUpdateObject', $args, false, $returnRaw);
+    }
+
     /**
      * Create the given leads.
      *
@@ -684,6 +824,93 @@ public function approveEmail($emailId, $args = array(), $returnRaw = false)
         return $this->getResult('approveEmailbyId', $args, false, $returnRaw);
     }
 
+    /**
+     * Describe the leads object
+     *
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Leads/describeUsingGET_2
+     *
+     * @return Response
+     */
+    public function describeLeads($returnRaw = false) {
+        return $this->describeObject('Leads', $returnRaw);
+    }
+
+    /**
+     * Describe the opportunities object
+     *
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Opportunities/describeUsingGET_3
+     *
+     * @return Response
+     */
+    public function describeOpportunities($returnRaw = false) {
+        return $this->describeObject('Opportunities', $returnRaw);
+    }
+
+    /**
+     * Describe the opportunities roles object.
+     *
+     * @param bool|false  $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Opportunities/describeOpportunityRoleUsingGET
+     *
+     * @return Response
+     */
+    public function describeOpportunityRoles($returnRaw = false) {
+        return $this->describeObject('Opportunities Roles', $returnRaw);
+    }
+
+    /**
+     * Describe the companies object.
+     *
+     * @param bool|false $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Companies/describeUsingGET
+     *
+     * @return Response
+     */
+    public function describeCompanies($returnRaw = false) {
+        return $this->describeObject('Companies', $returnRaw);
+    }
+
+    /**
+     * Describe the Sales Persons object.
+     *
+     * @param bool|false $returnRaw
+     * @throws \Exception
+     *
+     * @link http://developers.marketo.com/rest-api/endpoint-reference/lead-database-endpoint-reference/#!/Sales_Persons/describeUsingGET_4
+     *
+     * @return Response
+     */
+    public function describeSalesPersons($returnRaw = false) {
+        return $this->describeObject('Sales Persons', $returnRaw);
+    }
+
+    /**
+     * Generic method to describe a Marketo object.
+     *
+     * @param string      $objectName
+     * @param bool|false  $returnRaw
+     * @return Response
+     * @throws \Exception
+     */
+    private function describeObject($objectName, $returnRaw = false) {
+        if (!isset($this->marketoObjects[$objectName])) {
+            throw new \Exception('describeObject() Expected parameter $objectName, to be a valid Marketo object '  . "but $objectName provided");
+        };
+
+        $args['objectName'] = $this->marketoObjects[$objectName];
+        return $this->getResult('describeObject', $args, false, $returnRaw);
+    }
+
     /**
      * Internal helper method to actually perform command.
      *
diff --git a/src/service.json b/src/service.json
index 80d2709..a745e13 100644
--- a/src/service.json
+++ b/src/service.json
@@ -247,6 +247,25 @@
                 "id": {"location": "uri"}
                 },
             "responseClass": "CSD\\Marketo\\Response\\ApproveEmailResponse"
+        },
+        "describeObject": {
+            "httpMethod": "GET",
+            "uri": "/rest/v1/{objectName}/describe.json",
+            "parameters": {
+                "objectName": {"location": "uri"}
+            },
+            "responseClass": "CSD\\Marketo\\Response"
+        },
+        "createOrUpdateObject": {
+            "httpMethod": "POST",
+            "uri": "/rest/v1/{objectName}.json",
+            "parameters": {
+                "objectName": {"location": "uri"},
+                "action": {"location": "json"},
+                "input": {"location": "json"},
+                "dedupeBy": {"location": "json"}
+            },
+            "responseClass": "CSD\\Marketo\\Response\\GetLeadsResponse"
         }
     }
 }