diff --git a/modules/payment/config/schema/commerce_payment.schema.yml b/modules/payment/config/schema/commerce_payment.schema.yml
index 56cf9627b0..d43cbf0449 100644
--- a/modules/payment/config/schema/commerce_payment.schema.yml
+++ b/modules/payment/config/schema/commerce_payment.schema.yml
@@ -44,6 +44,10 @@ commerce_payment_gateway_configuration:
     mode:
       type: string
       label: 'Mode'
+    details:
+      type: text_format
+      label: 'Details'
+      translatable: true
     payment_method_types:
       type: sequence
       label: 'Payment method types'
diff --git a/modules/payment/src/Plugin/Commerce/CheckoutPane/PaymentInformation.php b/modules/payment/src/Plugin/Commerce/CheckoutPane/PaymentInformation.php
index 6cce21e053..53eb059592 100644
--- a/modules/payment/src/Plugin/Commerce/CheckoutPane/PaymentInformation.php
+++ b/modules/payment/src/Plugin/Commerce/CheckoutPane/PaymentInformation.php
@@ -118,6 +118,15 @@ public function buildPaneForm(array $pane_form, FormStateInterface $form_state,
 
     $selected_option = $pane_form['payment_method'][$default_option];
     $payment_gateway = $payment_gateways[$selected_option['#payment_gateway']];
+
+    // Add details markup if available.
+    if (empty($selected_option['#payment_method']) && $details = $payment_gateway->getPlugin()->getDetails()) {
+      $pane_form['details'] = [
+        '#type' => 'item',
+        '#markup' => check_markup($details['value'], $details['format']),
+      ];
+    }
+
     if ($payment_gateway->getPlugin() instanceof SupportsStoredPaymentMethodsInterface) {
       if (!empty($selected_option['#payment_method_type'])) {
         /** @var \Drupal\commerce_payment\PaymentMethodStorageInterface $payment_method_storage */
diff --git a/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayBase.php b/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayBase.php
index b4883d5b8e..0dc4917fa0 100644
--- a/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayBase.php
+++ b/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayBase.php
@@ -171,6 +171,14 @@ public function getSupportedModes() {
     return $this->pluginDefinition['modes'];
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getDetails() {
+    return ($this->configuration['details']['value']) ? $this->configuration['details'] : NULL;
+
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -251,6 +259,10 @@ public function defaultConfiguration() {
     return [
       'display_label' => $this->pluginDefinition['display_label'],
       'mode' => $modes ? reset($modes) : '',
+      'details' => [
+        'value' => '',
+        'format' => 'plain_text',
+      ],
       'payment_method_types' => [],
     ];
   }
@@ -270,6 +282,14 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
       '#description' => t('Shown to customers during checkout.'),
       '#default_value' => $this->configuration['display_label'],
     ];
+    $form['details'] = [
+      '#type' => 'text_format',
+      '#title' => $this->t('Additional details'),
+      '#description' => $this->t('Additional details about payment to be shown to the customer on checkout.'),
+      '#default_value' => $this->configuration['details']['value'],
+      '#format' => $this->configuration['details']['format'],
+      '#rows' => 2,
+    ];
 
     if (count($modes) > 1) {
       $form['mode'] = [
@@ -323,6 +343,7 @@ public function submitConfigurationForm(array &$form, FormStateInterface $form_s
       $this->configuration = [];
       $this->configuration['display_label'] = $values['display_label'];
       $this->configuration['mode'] = $values['mode'];
+      $this->configuration['details'] = $values['details'];
       $this->configuration['payment_method_types'] = array_keys($values['payment_method_types']);
     }
   }
diff --git a/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayInterface.php b/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayInterface.php
index 0d94eee8d8..40763ba5ed 100644
--- a/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayInterface.php
+++ b/modules/payment/src/Plugin/Commerce/PaymentGateway/PaymentGatewayInterface.php
@@ -51,6 +51,14 @@ public function getMode();
    */
   public function getSupportedModes();
 
+  /**
+   * Gets the details of the payment gateway or NULL if not defined..
+   *
+   * @return array|null
+   *   The details definition or NULL.
+   */
+  public function getDetails();
+
   /**
    * Gets the JS library ID.
    *
diff --git a/modules/payment/tests/src/Functional/PaymentGatewayTest.php b/modules/payment/tests/src/Functional/PaymentGatewayTest.php
index 5a70e81d7a..d257daeea2 100644
--- a/modules/payment/tests/src/Functional/PaymentGatewayTest.php
+++ b/modules/payment/tests/src/Functional/PaymentGatewayTest.php
@@ -36,11 +36,16 @@ public function testPaymentGatewayCreation() {
     $this->getSession()->getPage()->clickLink('Add payment gateway');
     $this->assertSession()->addressEquals('admin/commerce/config/payment-gateways/add');
 
+    $details = [
+      'value' => 'Test details',
+      'format' => 'plain_text',
+    ];
     $values = [
       'label' => 'Example',
       'plugin' => 'example_offsite_redirect',
       'configuration[example_offsite_redirect][redirect_method]' => 'post',
       'configuration[example_offsite_redirect][mode]' => 'test',
+      'configuration[example_offsite_redirect][details][value]' => $details['value'],
       'status' => '1',
       // Setting the 'id' can fail if focus switches to another field.
       // This is a bug in the machine name JS that can be reproduced manually.
@@ -60,6 +65,7 @@ public function testPaymentGatewayCreation() {
     $this->assertEquals(TRUE, $payment_gateway->status());
     $payment_gateway_plugin = $payment_gateway->getPlugin();
     $this->assertEquals('test', $payment_gateway_plugin->getMode());
+    $this->assertEquals($details, $payment_gateway_plugin->getDetails());
     $configuration = $payment_gateway_plugin->getConfiguration();
     $this->assertEquals('post', $configuration['redirect_method']);
   }
@@ -77,9 +83,14 @@ public function testPaymentGatewayEditing() {
     $payment_gateway = $this->createEntity('commerce_payment_gateway', $values);
 
     $this->drupalGet('admin/commerce/config/payment-gateways/manage/' . $payment_gateway->id());
+    $details = [
+      'value' => 'Test details',
+      'format' => 'plain_text',
+    ];
     $values += [
       'configuration[example_offsite_redirect][redirect_method]' => 'get',
       'configuration[example_offsite_redirect][mode]' => 'live',
+      'configuration[example_offsite_redirect][details][value]' => $details['value'],
       'conditionOperator' => 'OR',
     ];
     $this->submitForm($values, 'Save');
@@ -94,6 +105,7 @@ public function testPaymentGatewayEditing() {
     $this->assertEquals(FALSE, $payment_gateway->status());
     $payment_gateway_plugin = $payment_gateway->getPlugin();
     $this->assertEquals('live', $payment_gateway_plugin->getMode());
+    $this->assertEquals($details, $payment_gateway_plugin->getDetails());
     $configuration = $payment_gateway_plugin->getConfiguration();
     $this->assertEquals('get', $configuration['redirect_method']);
   }