class OAuth2::Strategy::Assertion

def build_assertion(claims, encoding_opts)
  raise ArgumentError.new(message: "Please provide an encoding_opts hash with :algorithm and :key") if !encoding_opts.is_a?(Hash) || (%i[algorithm key] - encoding_opts.keys).any?
  headers = {}
  headers[:kid] = encoding_opts[:kid] if encoding_opts.key?(:kid)
  JWT.encode(claims, encoding_opts[:key], encoding_opts[:algorithm], headers)
end