lcobucci/jwt

Hello, i am trying to use this library to decrypt some information that that i encrypted in my application. I used C++ in encrypting the data and i want to decrypt same using PHP in the server. This is how the encryption was done. I use https://github.com/Thalhammer/jwt-cpp for encryption

string encrypt(const std::string& input, const std::string& issuer, const std::string& key)
{
    auto token = jwt::create()
        .set_issuer(issuer)
        .set_type("JWS")
        .set_payload_claim("data", jwt::claim(input))
        .sign(jwt::algorithm::hs256{ key });
    return token;
}

I try to decrypt it using https://github.com/lcobucci/jwt/tree/3.3 in PHP

$file_data = file_get_contents("php://input");
try {
    var_dump("Creating a new parser from the received data");
    $token = (new Parser())->parse((string) $file_data); // Parses from a
    // string
    var_dump($token);
    $headers = $token->getHeaders(); // Retrieves the token header
    $claims = $token->getClaims(); // Retrieves the token claims
    var_dump($headers);
    echo $headers;
    var_dump("After decoding");
    $json_decoded = json_decode($token, true);
    var_dump("After json decoding");
    $file = fopen("decrypted.json", "wb");
    fwrite($file, $json_decoded);
    var_dump("After writing to file");
    fclose($file);
    echo $json_decoded;
}
catch (Exception | InvalidArgumentException $e) {
    error_log("Error parsing the encoded data " . $e->getMessage(), 0);
    var_dump("There was an error" . $e->getMessage());
}

I get There was an error The JWT string must have two dots. Can someone help me out with the decrypting. I can confirm that the encrypted data is received in the server.

Is there anything i am missing or not doing rightly?