LN Gateway used for LightningPayment + https://github.com/thorie7912/lightning-php

ln-gateway.php

<?php

if ($_SERVER['SERVER_NAME'] != 'ln-gateway') { echo 'Bad host'; exit; }

require_once __DIR__ . '/../app/Util/Autoloader.php';
require_once __DIR__ . '/../app/Util/Di.php';

use App\Util\Autoloader;
use App\Util\Di;

Di::getInstance()->get(Autoloader::class)->register();

class Lightning {

    const RPC = "unix:///home/thorie/.lightning/lightning-rpc";

public static function isJson($string) {
if (empty($string)) return false;
json_decode($string);
return (json_last_error() == JSON_ERROR_NONE);
}

    public static function sendCommand(array $input) {
        $factory = new \Socket\Raw\Factory();
        $socket = $factory->createClient(self::RPC);
        $socket->setBlocking(true);
        $socket->write(json_encode($input));
        $data = "";
        do {
            $data .= $socket->read(64);
        } while (!self::isJson($data) && $socket->assertAlive() && $socket->selectRead(65.0));
        $socket->close();
        $json = json_decode($data);
		if (json_last_error() !== JSON_ERROR_NONE) {
			var_dump($data);
			throw new \Exception("Bad JSON");
 		}
		return $json;
    }

    public static function getinfo() {
        $input = [
            "method" => "getinfo",
            "params" => [],
            "id" => 0
        ];
        return self::sendCommand($input);
    }

    public static function invoice($msatoshi, $label, $description) {
        $input = [
            "method" => "invoice",
            "params" => [
                "msatoshi" => $msatoshi,
                "label" => $label,
                "description" => $description,
                "expiry" => 900,
            ],
            "id" => 0
        ];
        return self::sendCommand($input);
    }

	public static function listinvoices($label) {
        $input = [
            "method" => "listinvoices",
            "params" => [
                "label" => $label,
            ],
            "id" => 0
        ];
        return self::sendCommand($input);
	}

    public static function decodepay($bolt11) {
        $input = [
            "method" => "decodepay",
            "params" => [
                "bolt11" => $bolt11,
            ],
            "id" => 0
        ];
        return self::sendCommand($input);
    }

    public static function pay($bolt11, $msatoshi) {
        $ret = self::decodepay($bolt11);

        if (intval($ret->result->msatoshi) !== intval($msatoshi)) {
            return ["result" =>
                "invoice did not match msatoshi specified ({$ret->result->msatoshi} vs $msatoshi)"];
        }


/**
pay bolt11 [msatoshi] [description] [riskfactor] [maxfeepercent] [retry_for] [maxdelay] [exemptfee]
    Send payment specified by {bolt11} with optional {msatoshi} (if and only if {bolt11} does not have amount), {description} (required if {bolt11} uses description hash), {riskfactor} (default 1.0), {maxfeepercent} (default 0.5) the maximum acceptable fee as a percentage (e.g. 0.5 => 0.5%), {exemptfee} (default 5000 msat) disables the maxfeepercent check for fees below the threshold, {retry_for} (default 60) the integer number of seconds before we stop retrying, and {maxdelay} (default 500) the maximum number of blocks we allow the funds to possibly get locked

*/


        $input = [
            "method" => "pay",
            "params" => [
                "bolt11" => $bolt11,
				"description" => "desc",
				"riskfactor" => "1.0",
				"maxfeepercent" => "0.5",
				"retry_for" => "10",
            ],
            "id" => 0
        ];
        return self::sendCommand($input);
    }

    public static function getroute($id, $msatoshi, $riskfactor) {
        $input = [
            "method" => "getroute",
            "params" => [
                "id" => $id,
                "msatoshi" => $msatoshi,
                "riskfactor" => $riskfactor,
            ],
            "id" => 0
        ];
        return self::sendCommand($input);
    }

}

$params = array_merge($_GET, $_POST);
error_reporting(E_ALL | E_STRICT);
ini_set('display_errors', true);
header("Content-type: application/json");

if (!isset($params['msatoshi']) && isset($params['btc'])) {
    $params['msatoshi'] = $params['btc'] * 100000000000;
}

switch ($params['method']) {
    case 'getinfo':
        $ret = Lightning::getinfo();
        break;
    case 'pay':
        $ret = Lightning::pay($params['bolt11'], $params['msatoshi']);
        break;
    case 'invoice':
        $ret = Lightning::invoice($params['msatoshi'], $params['label'], $params['description']);
        break;
    case 'listinvoices':
        $ret = Lightning::listinvoices($params['label']);
        break;
    case 'decodepay':
        $ret = Lightning::decodepay($params['bolt11']);
        break;
    case 'getroute':
        $ret = Lightning::getroute($params['id'], $params['msatoshi'], $params['riskfactor']);
        break;
    default:
        exit(0);
}

echo json_encode($ret, JSON_PRETTY_PRINT);