code: public function createJWTLoader(CheckerManagerInterface $checker_manager, VerifierInterface $verifier, DecrypterInterface $decrypter = null)
      {
          $jwt_loader = new JWTLoader($checker_manager, $verifier);
          if (null !== $decrypter) {
              $jwt_loader->enableDecryptionSupport($decrypter);
          }
  
          return $jwt_loader;
      }
docs: @param \Jose\Checker\CheckerManagerInterface $checker_manager
  @param \Jose\VerifierInterface               $verifier
  @param \Jose\DecrypterInterface|null         $decrypter
  
  @return \Jose\JWTLoader