code: public function setPhone($phone)
      {
  
          if (!is_null($phone) && (!preg_match("/^\\+?[\\d\\s]+$/", $phone))) {
              throw new \InvalidArgumentException("invalid value for $phone when calling Shopper., must conform to the pattern /^\\+?[\\d\\s]+$/.");
          }
  
          $this->container['phone'] = $phone;
  
          return $this;
      }
docs: Sets phone
  @param string $phone The shopper's contact phone number
  @return $this