Added descriptive message to admin payment link method

Block/Form/Paymentlink.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Copyright © 2018 Magmodules.eu. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Mollie\Payment\Block\Form;
+
+/**
+ * Class Paymentlink
+ *
+ * @package Mollie\Payment\Block\Form
+ */
+class Paymentlink extends \Magento\Payment\Block\Form
+{
+
+    /**
+     * @var string
+     */
+    protected $_template = 'Mollie_Payment::form/mollie_paymentlink.phtml';
+
+}

Block/Info/Paymentlink.php

@@ -13,4 +13,5 @@ class Paymentlink extends Base
      * @var string
      */
     protected $_template = 'Mollie_Payment::info/mollie_paymentlink.phtml';
+
 }

Model/Methods/Paymentlink.php

@@ -42,7 +42,13 @@ class Paymentlink extends Mollie
      *
      * @var string
      */
-    protected $_infoBlockType = 'Mollie\Payment\Block\Info\Paymentlink';
+    protected $_infoBlockType = \Mollie\Payment\Block\Info\Paymentlink::class;
+    /**
+     * Info instructions form path
+     *
+     * @var string
+     */
+    protected $_formBlockType = \Mollie\Payment\Block\Form\Paymentlink::class;
 
     /**
      * @param string $paymentAction

view/adminhtml/templates/form/mollie_paymentlink.phtml

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Copyright © 2018 Magmodules.eu. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+// @codingStandardsIgnoreFile
+/**
+ * @var \Mollie\Payment\Block\Form\Paymentlink $block
+ * @see \Mollie\Payment\Block\Form\Paymentlink
+
+// @codingStandardsIgnoreFile
+/**
+ * @var \Magento\Payment\Block\Adminhtml\Transparent\Form $block
+ */
+$code = $block->escapeHtml($block->getMethodCode());
+?>
+<fieldset class="admin__fieldset payment-method" id="payment_form_<?php /* @noEscape */ echo $code; ?>" style="display:none">
+    <?= $block->escapeHtml(__('Create a Mollie Payment link and add this to the order email.')); ?>
+</fieldset>