diff --git a/config/install/payment.payment_method_configuration.payment_postfinance_payment_form.yml b/config/install/payment.payment_method_configuration.payment_postfinance_payment_form.yml
index 4f54cc3..64614b4 100644
--- a/config/install/payment.payment_method_configuration.payment_postfinance_payment_form.yml
+++ b/config/install/payment.payment_method_configuration.payment_postfinance_payment_form.yml
@@ -8,6 +8,6 @@ pluginConfiguration:
   language: 'en_US'
   sha_in_key: ''
   sha_out_key: ''
+  debug: FALSE
 pluginId: payment_postfinance_payment_form
 status: true
-uuid: 324fad23-d1da-4059-b621-3378fa67b480
diff --git a/config/schema/payment_postfinance_payment_form.schema.yml b/config/schema/payment_postfinance_payment_form.schema.yml
index 802ccdb..5d58524 100644
--- a/config/schema/payment_postfinance_payment_form.schema.yml
+++ b/config/schema/payment_postfinance_payment_form.schema.yml
@@ -10,6 +10,9 @@ payment.plugin_configuration.payment_method_configuration.payment_postfinance_pa
     sha_out_key:
       type: string
       label: SHA Out Key
+    debug:
+      type: boolean
+      label: Log repsonses
     language:
       type: string
       label: Language
diff --git a/src/Controller/PostfinanceResponseController.php b/src/Controller/PostfinanceResponseController.php
index 6eabdbc..09574bc 100644
--- a/src/Controller/PostfinanceResponseController.php
+++ b/src/Controller/PostfinanceResponseController.php
@@ -33,6 +33,15 @@ class PostfinanceResponseController {
    *   The Response to the accepting request.
    */
   public function processAcceptResponse(Request $request, PaymentInterface $payment) {
+    if (\Drupal::config('payment.payment_method_configuration.payment_postfinance_payment_form')->get('pluginConfiguration')['debug']) {
+      if (\Drupal::moduleHandler()->moduleExists('past')) {
+        past_event_save('postfinance', 'response_success', 'Success response - Payment ' . $payment->id() . ': POST data', ['POST' => $request->request->all(), 'Payment' => $payment]);
+      }
+      else {
+        \Drupal::logger('postfinance')->debug(t('Payment success response: @response', ['@response' => implode(', ', $request->request->all())]));
+      }
+    }
+
     // The definition of the plugin implementation.
     $plugin_definition = $payment->getPaymentMethod()->getPluginDefinition();
 
@@ -78,6 +87,14 @@ public function processAcceptResponse(Request $request, PaymentInterface $paymen
    *   The Response to the accepting request.
    */
   public function processDeclineResponse(Request $request, PaymentInterface $payment) {
+    if (\Drupal::config('payment.payment_method_configuration.payment_postfinance_payment_form')->get('pluginConfiguration')['debug']) {
+      if (\Drupal::moduleHandler()->moduleExists('past')) {
+        past_event_save('postfinance', 'response_decline', 'Decline response - Payment ' . $payment->id() . ': POST data', ['POST' => $request->request->all(), 'Payment' => $payment]);
+      }
+      else {
+        \Drupal::logger('postfinance')->debug(t('Payment decline response: @response', ['@response' => implode(', ', $request->request->all())]));
+      }
+    }
 
     $request_data = $request->query->all();
     if ($request_data['STATUS'] == 2) {
@@ -109,6 +126,14 @@ public function processDeclineResponse(Request $request, PaymentInterface $payme
    *   The Response to the accepting request.
    */
   public function processExceptionResponse(Request $request, PaymentInterface $payment) {
+    if (\Drupal::config('payment.payment_method_configuration.payment_postfinance_payment_form')->get('pluginConfiguration')['debug']) {
+      if (\Drupal::moduleHandler()->moduleExists('past')) {
+        past_event_save('postfinance', 'response_exception', 'Exception response - Payment ' . $payment->id() . ': POST data', ['POST' => $request->request->all(), 'Payment' => $payment]);
+      }
+      else {
+        \Drupal::logger('postfinance')->debug(t('Payment exception response: @response', ['@response' => implode(', ', $request->request->all())]));
+      }
+    }
 
     $request_data = $request->query->all();
     if ($request_data['STATUS'] == 52 || $request_data['STATUS'] == 92) {
@@ -140,6 +165,14 @@ public function processExceptionResponse(Request $request, PaymentInterface $pay
    *   The Response to the accepting request.
    */
   public function processCancelResponse(Request $request, PaymentInterface $payment) {
+    if (\Drupal::config('payment.payment_method_configuration.payment_postfinance_payment_form')->get('pluginConfiguration')['debug']) {
+      if (\Drupal::moduleHandler()->moduleExists('past')) {
+        past_event_save('postfinance', 'response_cancel', 'Cancel response - Payment ' . $payment->id() . ': POST data', ['POST' => $request->request->all(), 'Payment' => $payment]);
+      }
+      else {
+        \Drupal::logger('postfinance')->debug(t('Payment cancel response: @response', ['@response' => implode(', ', $request->request->all())]));
+      }
+    }
 
     $request_data = $request->query->all();
     if ($request_data['STATUS'] == 1) {
diff --git a/src/Plugin/Payment/MethodConfiguration/PostfinancePaymentFormConfiguration.php b/src/Plugin/Payment/MethodConfiguration/PostfinancePaymentFormConfiguration.php
index 93bc3d0..59af100 100644
--- a/src/Plugin/Payment/MethodConfiguration/PostfinancePaymentFormConfiguration.php
+++ b/src/Plugin/Payment/MethodConfiguration/PostfinancePaymentFormConfiguration.php
@@ -80,6 +80,7 @@ public function defaultConfiguration() {
       'language' => '',
       'sha_in_key' => '',
       'sha_out_key' => '',
+      'debug' => FALSE,
     );
   }
 
@@ -150,6 +151,22 @@ public function setLanguage($language) {
   public function getLanguage() {
     return $this->configuration['language'];
   }
+  /**
+   * En/disable logging the response from Postfinance.
+   *
+   * @param bool $state
+   *   Whether debugging should be dis/enabled.
+   */
+  public function setDebug($state = TRUE) {
+    $this->configuration['debug'] = $state;
+  }
+
+  /**
+   * Returns the state of the debug setting.
+   */
+  public function getDebug() {
+    return $this->configuration['debug'];
+  }
 
   /**
    * {@inheritdoc}
@@ -190,6 +207,12 @@ public function buildConfigurationForm(array $form, FormStateInterface $form_sta
       '#default_value' => $this->getLanguage(),
     );
 
+    $form['debug'] = array(
+      '#type' => 'checkbox',
+      '#title' => 'Log response from Postfinance server',
+      '#default_value' => $this->getDebug(),
+    );
+
     // @TODO: Create production and testing option.
 
     return $form;
@@ -212,6 +235,7 @@ public function formElementsValidate(array $element, FormStateInterface $form_st
     $this->setShaInKey($values['sha_in_key']);
     $this->setShaOutKey($values['sha_out_key']);
     $this->setLanguage($values['language']);
+    $this->setDebug($values['debug']);
   }
 
 }
diff --git a/src/Tests/PostfinancePaymentTest.php b/src/Tests/PostfinancePaymentTest.php
index 03f681a..0a54df3 100644
--- a/src/Tests/PostfinancePaymentTest.php
+++ b/src/Tests/PostfinancePaymentTest.php
@@ -29,6 +29,7 @@ class PostfinancePaymentTest extends WebTestBase {
     'payment_postfinance_test',
     'node',
     'field_ui',
+    'dblog',
   );
 
   /**
@@ -110,6 +111,7 @@ protected function setUp() {
       'access administration pages',
       'access user profiles',
       'payment.payment.view.any',
+      'access site reports',
     ));
     $this->drupalLogin($this->admin_user);
 
@@ -139,6 +141,16 @@ function testPostfinanceAcceptPayment() {
     \Drupal::state()->set('postfinance.return_url_key', 'ACCEPT');
     \Drupal::state()->set('postfinance.testing', TRUE);
 
+    $this->drupalGet('admin/config/services/payment/method/configuration/payment_postfinance_payment_form');
+    // Test the debug checkbox.
+    $this->assertNoFieldChecked('edit-plugin-form-debug');
+    $edit = [
+        'plugin_form[debug]' => TRUE,
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+    $this->drupalGet('admin/config/services/payment/method/configuration/payment_postfinance_payment_form');
+    $this->assertFieldChecked('edit-plugin-form-debug');
+
     // Create postfinance payment.
     $this->drupalPostForm('node/' . $this->node->id(), array(), t('Pay'));
 
@@ -178,6 +190,10 @@ function testPostfinanceAcceptPayment() {
     $this->assertText('CHF 123.00');
     $this->assertText('CHF 246.00');
     $this->assertText('Completed');
+
+    // Check the log for the response debug.
+    $this->drupalGet('/admin/reports/dblog');
+    $this->assertText('Payment success response:');
   }
 
   /**
@@ -186,7 +202,7 @@ function testPostfinanceAcceptPayment() {
   function testPostfinanceDeclinePayment() {
     // Set payment to decline.
     \Drupal::state()->set('postfinance.return_url_key', 'DECLINE');
-
+    $this->drupalPostForm('admin/config/services/payment/method/configuration/payment_postfinance_payment_form', ['plugin_form[debug]' => TRUE], t('Save'));
 
     // Load payment configuration.
     $payment_config = $this->config('payment_postfinance.settings');
@@ -206,12 +222,19 @@ function testPostfinanceDeclinePayment() {
     $this->drupalGet('payment/1');
     $this->assertNoText('Completed');
     $this->assertText('Failed');
+
+    // Check the log for the response debug.
+    $this->drupalGet('/admin/reports/dblog');
+    $this->assertText('Payment decline response:');
   }
 
   /**
    * Tests exception Postfinance payment.
    */
   function testPostfinanceExceptionPayment() {
+    // Enable logging of responses.
+    $this->drupalPostForm('admin/config/services/payment/method/configuration/payment_postfinance_payment_form', ['plugin_form[debug]' => TRUE], t('Save'));
+
     // Set callback status to decline payment.
     \Drupal::state()->set('postfinance.callback_status', 52);
     \Drupal::state()->set('postfinance.testing', TRUE);
@@ -230,12 +253,19 @@ function testPostfinanceExceptionPayment() {
     $this->drupalGet('payment/1');
     $this->assertNoText('Completed');
     $this->assertText('Failed');
+
+    // Check the log for the response debug.
+    $this->drupalGet('/admin/reports/dblog');
+    $this->assertText('Payment exception response:');
   }
 
   /**
    * Tests cancel Postfinance payment.
    */
   function testPostfinanceCancelPayment() {
+    // Enable logging of responses.
+    $this->drupalPostForm('admin/config/services/payment/method/configuration/payment_postfinance_payment_form', ['plugin_form[debug]' => TRUE], t('Save'));
+
     // Set callback status to decline payment.
     \Drupal::state()->set('postfinance.callback_status', 1);
     \Drupal::state()->set('postfinance.testing', TRUE);
@@ -254,6 +284,10 @@ function testPostfinanceCancelPayment() {
     $this->drupalGet('payment/1');
     $this->assertNoText('Completed');
     $this->assertText('Cancelled');
+
+    // Check the log for the response debug.
+    $this->drupalGet('/admin/reports/dblog');
+    $this->assertText('Payment cancel response:');
   }
   /**
    * Tests wrong signature validation in Postfinance payment.