/**
  * resolves identification
  *
  * @param \Abobereich\ApiClient\Models\Model|Plan $model
  * @param array $data
  *
  * @return array|bool
  */
 protected function resolveIdentification(Model $model, array $data)
 {
     if (!empty($model->getId())) {
         $data['plan_id'] = $model->getId();
         return $data;
     }
     if (!empty($model->getExternalIdentifier())) {
         $data['plan_identifier'] = $model->getExternalIdentifier();
         return $data;
     }
     if (!empty($model->getSlug())) {
         $data['plan_slug'] = $model->getSlug();
         return $data;
     }
     return false;
 }