diff --git a/src/Client/SubResource/TransactionSubResource.php b/src/Client/SubResource/TransactionSubResource.php
index d884234..ad7c6e2 100644
--- a/src/Client/SubResource/TransactionSubResource.php
+++ b/src/Client/SubResource/TransactionSubResource.php
@@ -44,6 +44,27 @@ public function create(
     }
 
 
+    /**
+     * Updates an existing transaction
+     *
+     * @param Attribute\Id\OrganizationId $organizationId       Use reseller org id if reseller
+     */
+    public function update(
+        Attribute\Id\OrganizationId $organizationId,
+        Attribute\Id\LocationId $locationId,
+        Model\Transaction $transaction
+    ): Model\Transaction
+    {
+        $uri = UriBuilder::build('organizations/%s/locations/%s/transactions/', [
+            $organizationId->getValue(),
+            $locationId->getValue(),
+        ]);
+
+        return $this->getHttpClient()
+            ->makeModelRequest('put', $uri, Model\Transaction::class, $transaction);
+    }
+
+
     /**
      * Finds a single transaction
      *
diff --git a/src/Model/Transaction.php b/src/Model/Transaction.php
index 5057bb4..68b2ceb 100644
--- a/src/Model/Transaction.php
+++ b/src/Model/Transaction.php
@@ -10,7 +10,7 @@
 
 class Transaction extends AbstractModel
 {
-    
+
     /**
      * @var Attribute\Id\OrganizationId
      */