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Last updated: 03-Apr-2024
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Use the login method for the authentication process in the 2Checkout system.


Parameters Type/Description
merchantCode Required (String)
  Your merchant identification code.
date Required (String)
  GMT ISO Date format (e.g. 2010-01-01 12:13:14)
hash Required (Object)
  Calculated HMAC_SHA256 signature based on merchantCode and date, using your secret key.







Session identifier, the output of the Login method. Include sessionID into all your requests. 2Checkout throws an exception if the values are incorrect.



 * @throws JsonException
function callRPC($Request, $host) {
    $curl = curl_init($host);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 1);
    curl_setopt($curl, CURLOPT_VERBOSE, true);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($curl, CURLOPT_SSLVERSION, 0);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Accept: application/json'));
    $RequestString = json_encode($Request, JSON_THROW_ON_ERROR);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $RequestString);

    $ResponseString = curl_exec($curl);

    if (!empty($ResponseString)) {
        $Response = json_decode($ResponseString, false, 512, JSON_THROW_ON_ERROR);
        if (isset($Response->result)) {
            return $Response->result;
        if (!is_null($Response->error)) {
            echo("Method: {$Request->method}" . PHP_EOL);
            echo("Error: {$Request->error}" . PHP_EOL);
    } else {
        return null;
    return null;

$host = '';

$merchantCode = "YOUR_MERCHANT_CODE"; // your account's merchant code available in the 'System settings' area of the cPanel:
$key = "YOUR_SECRET_KEY"; // your account's secret key available in the 'System settings' area of the cPanel:

$string = strlen($merchantCode) . $merchantCode . strlen(gmdate('Y-m-d H:i:s')) . gmdate('Y-m-d H:i:s');
$algo = "sha256";
$hash = hash_hmac($algo, $string, $key);

$i = 1;

$jsonRpcRequest = new stdClass();
$jsonRpcRequest->jsonrpc = '2.0';
$jsonRpcRequest->method = 'login';
$jsonRpcRequest->params = array($merchantCode, gmdate('Y-m-d H:i:s'), $hash, $algo);
$jsonRpcRequest->id = $i++;

try {
    $sessionID = callRPC($jsonRpcRequest, $host);
    echo("Auth token: {$sessionID}" . PHP_EOL);
} catch (JsonException $e) {
    echo("Error: {$e->getMessage()}" . PHP_EOL);
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