diff --git a/src/Chullo.php b/src/Chullo.php
index 49f9541..f15221c 100644
--- a/src/Chullo.php
+++ b/src/Chullo.php
@@ -153,11 +153,10 @@ public function getGraph(
     /**
      * Creates a new resource in Fedora.
      *
-     * @param string    $uri            Resource URI
-     * @param string    $content        String or binary content
-     * @param array     $headers        HTTP Headers
-     * @param string    $transaction    Transaction id
-     * @param string    $checksum       SHA-1 checksum
+     * @param string    $uri                  Resource URI
+     * @param string    $content              String or binary content
+     * @param array     $headers              HTTP Headers
+     * @param string    $transaction          Transaction id
      *
      * @return string   Uri of newly created resource or null if failed
      */
@@ -165,15 +164,13 @@ public function createResource(
         $uri = "",
         $content = null,
         $headers = [],
-        $transaction = "",
-        $checksum = ""
+        $transaction = ""
     ) {
         $response = $this->api->createResource(
             $uri,
             $content,
             $headers,
-            $transaction,
-            $checksum
+            $transaction
         );
 
         if ($response->getStatusCode() != 201) {
@@ -188,11 +185,10 @@ public function createResource(
     /**
      * Saves a resource in Fedora.
      *
-     * @param string    $uri            Resource URI
-     * @param string    $content        String or binary content
-     * @param array     $headers        HTTP Headers
-     * @param string    $transaction    Transaction id
-     * @param string    $checksum       SHA-1 checksum
+     * @param string    $uri                  Resource URI
+     * @param string    $content              String or binary content
+     * @param array     $headers              HTTP Headers
+     * @param string    $transaction          Transaction id
      *
      * @return boolean  True if successful
      */
@@ -200,15 +196,13 @@ public function saveResource(
         $uri,
         $content = null,
         $headers = [],
-        $transaction = "",
-        $checksum = ""
+        $transaction = ""
     ) {
         $response = $this->api->saveResource(
             $uri,
             $content,
             $headers,
-            $transaction,
-            $checksum
+            $transaction
         );
 
         return $response->getStatusCode() == 204;
@@ -232,15 +226,17 @@ public function saveGraph(
         $turtle = $graph->serialise('turtle');
 
         // Checksum it.
-        $checksum = sha1($turtle);
+        $checksum_value = sha1($turtle);
 
         // Save it.
         return $this->saveResource(
             $uri,
             $turtle,
-            ['Content-Type' => 'text/turtle'],
-            $transaction,
-            $checksum
+            [
+              'Content-Type' => 'text/turtle',
+              'digest' => 'sha1='.$checksum_value
+            ],
+            $transaction
         );
     }
 
diff --git a/src/FedoraApi.php b/src/FedoraApi.php
index ca6a459..b90e22e 100644
--- a/src/FedoraApi.php
+++ b/src/FedoraApi.php
@@ -139,11 +139,10 @@ public function getResourceOptions($uri = "")
     /**
      * Creates a new resource in Fedora.
      *
-     * @param string    $uri            Resource URI
-     * @param string    $content        String or binary content
-     * @param array     $headers        HTTP Headers
-     * @param string    $transaction    Transaction id
-     * @param string    $checksum       SHA-1 checksum
+     * @param string    $uri                  Resource URI
+     * @param string    $content              String or binary content
+     * @param array     $headers              HTTP Headers
+     * @param string    $transaction          Transaction id
      *
      * @return ResponseInterface
      */
@@ -151,8 +150,7 @@ public function createResource(
         $uri = "",
         $content = null,
         $headers = [],
-        $transaction = "",
-        $checksum = ""
+        $transaction = ""
     ) {
         $options = ['http_errors' => false];
 
@@ -162,11 +160,6 @@ public function createResource(
         // Set headers.
         $options['headers'] = $headers;
 
-        // Set query string.
-        if (!empty($checksum)) {
-            $options['query'] = ['checksum' => $checksum];
-        }
-
         // Ensure uri takes transaction into account.
         $uri = $this->prepareUri($uri, $transaction);
 
@@ -180,11 +173,10 @@ public function createResource(
     /**
      * Saves a resource in Fedora.
      *
-     * @param string    $uri            Resource URI
-     * @param string    $content        String or binary content
-     * @param array     $headers        HTTP Headers
-     * @param string    $transaction    Transaction id
-     * @param string    $checksum       SHA-1 checksum
+     * @param string    $uri                  Resource URI
+     * @param string    $content              String or binary content
+     * @param array     $headers              HTTP Headers
+     * @param string    $transaction          Transaction id
      *
      * @return ResponseInterface
      */
@@ -192,8 +184,7 @@ public function saveResource(
         $uri,
         $content = null,
         $headers = [],
-        $transaction = "",
-        $checksum = ""
+        $transaction = ""
     ) {
         $options = ['http_errors' => false];
 
@@ -203,11 +194,6 @@ public function saveResource(
         // Set headers.
         $options['headers'] = $headers;
 
-        // Set query string.
-        if (!empty($checksum)) {
-            $options['query'] = ['checksum' => $checksum];
-        }
-
         // Ensure uri takes transaction into account.
         $uri = $this->prepareUri($uri, $transaction);
 
diff --git a/src/IFedoraApi.php b/src/IFedoraApi.php
index 52e841b..65103c5 100644
--- a/src/IFedoraApi.php
+++ b/src/IFedoraApi.php
@@ -71,35 +71,31 @@ public function getResourceOptions($uri = "");
     /**
      * Creates a new resource in Fedora.
      *
-     * @param string    $uri            Resource URI
-     * @param string    $content        String or binary content
-     * @param array     $headers        HTTP Headers
-     * @param string    $transaction    Transaction id
-     * @param string    $checksum       SHA-1 checksum
+     * @param string    $uri                  Resource URI
+     * @param string    $content              String or binary content
+     * @param array     $headers              HTTP Headers
+     * @param string    $transaction          Transaction id
      */
     public function createResource(
         $uri = "",
         $content = null,
         $headers = [],
-        $transaction = "",
-        $checksum = ""
+        $transaction = ""
     );
 
     /**
      * Saves a resource in Fedora.
      *
-     * @param string    $uri            Resource URI
-     * @param string    $content        String or binary content
-     * @param array     $headers        HTTP Headers
-     * @param string    $transaction    Transaction id
-     * @param string    $checksum       SHA-1 checksum
+     * @param string    $uri                  Resource URI
+     * @param string    $content              String or binary content
+     * @param array     $headers              HTTP Headers
+     * @param string    $transaction          Transaction id
      */
     public function saveResource(
         $uri,
         $content = null,
         $headers = [],
-        $transaction = "",
-        $checksum = ""
+        $transaction = ""
     );
 
     /**
diff --git a/test/CreateTransactionTest.php b/test/CreateTransactionTest.php
index 669c461..aaeee97 100644
--- a/test/CreateTransactionTest.php
+++ b/test/CreateTransactionTest.php
@@ -43,12 +43,12 @@ public function testReturnsNullOtherwise()
         ]);
 
         $handler = HandlerStack::create($mock);
-        $guzzle = new Client(['handler' => $handler]);
+        $guzzle = new Client(['handler' => $handler, 'base_uri' => 'http://localhost:8080/fcrepo/rest']);
         $api = new FedoraApi($guzzle);
         $client = new Chullo($api);
 
         //404
-        $result = $client->createResource();
+        $result = $client->createTransaction();
         $this->assertNull($result);
     }
 }