don't send mail after order creation and update module to version 1.0.0

app/code/Adyen/Payment/Model/Method/Cc.php

@@ -168,6 +168,13 @@ class Cc extends \Magento\Payment\Model\Method\Cc
             throw new \Magento\Framework\Exception\LocalizedException(__('The authorize action is not available.'));
         }
 
+        /*
+         * do not send order confirmation mail after order creation wait for
+         * Adyen AUTHORIISATION notification
+         */
+        $order = $payment->getOrder();
+        $order->setCanSendNewEmailFlag(false);
+
         // do not let magento set status to processing
         $payment->setLastTransId($this->getTransactionId())->setIsTransactionPending(true);
 

app/code/Adyen/Payment/Model/Method/Hpp.php

@@ -146,6 +146,14 @@ class Hpp extends \Magento\Payment\Model\Method\AbstractMethod implements Gatewa
 
     public function initialize($paymentAction, $stateObject)
     {
+        /*
+         * do not send order confirmation mail after order creation wait for
+         * Adyen AUTHORIISATION notification
+         */
+        $payment = $this->getInfoInstance();
+        $order = $payment->getOrder();
+        $order->setCanSendNewEmailFlag(false);
+
         $state = \Magento\Sales\Model\Order::STATE_NEW;
         $stateObject->setState($state);
         $stateObject->setStatus($this->_adyenHelper->getAdyenAbstractConfigData('order_status'));

app/code/Adyen/Payment/etc/module.xml

@@ -23,7 +23,7 @@
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">
-    <module name="Adyen_Payment" setup_version="0.1.0">
+    <module name="Adyen_Payment" setup_version="1.0.0">
         <sequence>
             <module name="Magento_Sales"/>
             <module name="Magento_Quote"/>