$form['#tree'] = TRUE;
    $form['clients_enabled'] = array(
      '#title' => t('Enable PixelPin OpenID Connect'),
      '#type' => 'checkboxes',
      '#options' => array('pixelpin' => $this->t('Enable')),
      '#default_value' => $clients_enabled,
    );

public function buildForm(array $form, FormStateInterface $form_state) {
    $definitions = $this->pluginManager->getDefinitions();
    foreach ($definitions as $client_id => $client) {
      foreach ($this->pluginManager->getDefinitions() as $client_name => $client_plugin) {
        if (!$this->config('pixelpin_openid_connect.settings.' . $client_id)
          ->get('enabled')) {
          $url = Drupal::service('path.current')->getPath();

          $find = 'login';

          $pos = strpos($url, $find);

          if ($pos === false){
                $value = 'Register Using @client_title';
            } else {
                $value = 'Log in with @client_title';
            }

          $element = 'clients_enabled[' . $client_plugin['id'] . ']';
          $form['pixelpin_openid_connect_client_' . $client_id . '_login'] = array(
            '#type' => 'submit',
            '#value' => t($value, array(
              '@client_title' => $client['label'],
            )),
            'visible' => array(
              ':input[name="' . $element . '"]' => array('checked' => TRUE),
            ),
            '#name' => $client_id,
            '#prefix' => '<div>',
            '#suffix' => '</div>',
          );
        }
      }
    }
    return $form;