blah.php

<?php
public function onTotalsCalculate() {
    $storedPassword = $this->config->get('plugins.gravel.webhook_password');
    $providedPassword = $this->grav['uri']->param('p');

    if ($storedPassword === $providedPassword) {
      $flex       = Grav::instance()['flex'];
      $reviewsCol = $flex->getCollection('reviews');
      $locationsDir = $flex->getDirectory('locations');
      $reviewsApproved = $reviewsCol->filterBy(['approved' => true, 'processed' => false]);
      $reviewsProcessed = $reviewsCol->filterBy(['processed' => true]);

      $locationsProcessedInTask = [];
      $totalProcessedInTask = 0;

      foreach ($reviewsApproved as $ra) {
        $cafeKey = $ra->getProperty('cafe_key');
        $locationObj = $locationsDir->getObject($cafeKey);

        if (!$locationObj) {
          continue;
        }

        $ratingsKeyList = $this->getRatingsKeyList();
        $total_numbers = 1;

        foreach ($reviewsProcessed as $rp) {
          if ($rp->getProperty('cafe_key') == $cafeKey) {
            $total_numbers++;
          }
        }

        foreach ($ratingsKeyList as $key) {
          $new_number = $ra->getProperty($key);
          $key = str_replace('cafe_', '', $key);
          $last_average = $locationObj->getProperty($key);
  
          $new_average = (($last_average * $total_numbers) + $new_number) / ($total_numbers + 1);

          $locationObj->setProperty($key, round($new_average));
          $locationObj->save();
        }

        array_push($locationsProcessedInTask, $locationObj);
        $totalProcessedInTask++;
      }

      $this->json([
        'success' => true,
        'rating_keys' => $this->getRatingsKeyList(),
        'locations_processed_in_task' => $locationsProcessedInTask
      ]);
    } else {
      $response = new Response(403);
      $this->grav->close($response);
    }
  }
```