code: public function listPlans(array $filters = [], bool $withAddons = true, string $addonType = null): array
      {
          $cacheKey = 'plans';
          $hit = $this->getFromCache($cacheKey);
  
          if (false === $hit) {
              $response = $this->sendRequest('GET', 'plans');
  
              $plans = $this->processResponse($response);
              $hit = $plans['plans'];
  
              $this->saveToCache($cacheKey, $hit);
          }
  
          $hit = $this->filterPlans($hit, $filters);
  
          if ($withAddons) {
              $hit = $this->getAddonsForPlan($hit, $addonType);
          }
  
          return $hit;
      }
docs: Returns all plans.
  
  @param array $filters associative array of filters
  
  @throws \Exception
  
  @return array