reverted:
--- b/simple_oauth.install
+++ /dev/null
@@ -1,23 +0,0 @@
-<?php
-
-/**
- * @file
- * Install, update and uninstall functions for Social Auth.
- */
-
-use Drupal\Core\Database\Database;
-
-/**
- * Add field 'third_party' when not exist.
- */
-function simple_oauth_update_8301() {
-  $schema = Database::getConnection()->schema();
-  if ($schema->tableExists('consumer') && !$schema->fieldExists('consumer', 'third_party')) {
-    $field = [
-      'type' => 'int',
-      'size' => 'tiny',
-      'not null' => FALSE,
-    ];
-    $schema->addField('consumer', 'third_party', $field);
-  }
-}
reverted:
--- b/simple_oauth.module
+++ a/simple_oauth.module
@@ -83,21 +83,6 @@
         'type' => 'options_buttons',
         'weight' => 5,
       ]);
-
-    $fields['third_party'] = BaseFieldDefinition::create('boolean')
-      ->setLabel(new TranslatableMarkup('Is this client 3rd party?'))
-      ->setDescription(new TranslatableMarkup('A boolean indiacting whether the client is 3rd party or not.'))
-      ->setDisplayOptions('view', [
-        'label' => 'inline',
-        'type' => 'boolean',
-        'weight' => 4,
-      ])
-      ->setDisplayOptions('form', [
-        'weight' => 4,
-      ])
-      ->setRevisionable(TRUE)
-      ->setTranslatable(TRUE)
-      ->setDefaultValue(TRUE);
   }
   return $fields;
 }
diff -u b/simple_oauth_extras/simple_oauth_extras.routing.yml b/simple_oauth_extras/simple_oauth_extras.routing.yml
--- b/simple_oauth_extras/simple_oauth_extras.routing.yml
+++ b/simple_oauth_extras/simple_oauth_extras.routing.yml
@@ -1,8 +1,8 @@
 oauth2_token_extras.authorize:
   path: '/oauth/authorize'
   defaults:
-    _controller: 'Drupal\simple_oauth_extras\Controller\Oauth2AuthorizeController::authorize'
-    _title: 'Grant Access to Client'
+   _controller: 'Drupal\simple_oauth_extras\Controller\Oauth2AuthorizeController::authorize'
+   _title: 'Grant Access to Client'
   methods: [GET, POST]
   requirements:
     _access: 'TRUE'
diff -u b/simple_oauth_extras/src/Controller/Oauth2AuthorizeController.php b/simple_oauth_extras/src/Controller/Oauth2AuthorizeController.php
--- b/simple_oauth_extras/src/Controller/Oauth2AuthorizeController.php
+++ b/simple_oauth_extras/src/Controller/Oauth2AuthorizeController.php
@@ -56,15 +56,32 @@
     if (empty($client_uuid)) {
       throw OAuthServerException::invalidClient();
     }
-    $client_drupal_entities = $this->entityTypeManager()->getStorage('consumer')->loadByProperties([
-      'uuid' => $client_uuid,
-    ]);
+    $client_drupal_entities = $this->entityTypeManager()
+      ->getStorage('consumer')
+      ->loadByProperties([
+        'uuid' => $client_uuid,
+      ]);
     if (empty($client_drupal_entities)) {
       throw OAuthServerException::invalidClient();
     }
 
     $client_drupal_entity = reset($client_drupal_entities);
-    if ($this->currentUser()->isAuthenticated() && $client_drupal_entity->get('third_party')->getString() == 0) {
+
+    $accessPreviouslyConfirmed = false;
+
+    $previous_token_entities = $this->entityTypeManager()
+      ->getStorage('oauth2_token')
+      ->loadByProperties([
+        'auth_user_id' => $this->currentUser()->id(),
+        'client' => $client_uuid,
+      ]);
+    if(!empty($previous_token_entities)){
+      $accessPreviouslyConfirmed = true;
+    }
+
+    if ($this->currentUser()
+        ->isAuthenticated() && ($client_drupal_entity->get('third_party')
+        ->getString() == 0 || $accessPreviouslyConfirmed)) {
       if ($request->get('response_type') == 'code') {
         $grant_type = 'code';
       }
@@ -80,9 +97,11 @@
         $user_entity = new UserEntity();
         $user_entity->setIdentifier($this->currentUser()->id());
         $auth_request->setUser($user_entity);
-        $can_grant_codes = $this->currentUser()->hasPermission('grant simple_oauth codes');
+        $can_grant_codes = $this->currentUser()
+          ->hasPermission('grant simple_oauth codes');
         $auth_request->setAuthorizationApproved($can_grant_codes);
-        $response = $server->completeAuthorizationRequest($auth_request, new Response());
+        $response = $server->completeAuthorizationRequest($auth_request,
+          new Response());
         $redirect_response = TrustedRedirectResponse::create(
           $response->getHeaderLine('location'),
           $response->getStatusCode(),
@@ -92,7 +111,8 @@
       }
     }
     else {
-      return \Drupal::formBuilder()->getForm('Drupal\simple_oauth_extras\Controller\Oauth2AuthorizeForm');
+      return \Drupal::formBuilder()
+        ->getForm('Drupal\simple_oauth_extras\Controller\Oauth2AuthorizeForm');
     }
   }