Skip to main content


Last updated: 03-Apr-2024
Rate this article:


Use the login method for the authentication process in the 2Checkout system.


Parameters Type/Description
merchantCode required (string)
  Your merchant identifier (received from 2Checkout).
date required (string)
  UTC ISO Date format (e.g. 2010-01-01 12:13:14)
hash required (string)
  Calculated HMAC_SHA256 signature based on MerchantCode and Date, using your secret key (see example below).


Parameter Type/Description



  Session identifier string. An exception will be thrown if the values are incorrect. The sessionID expires in 10 minutes.


To create the HMAC_SHA256 source string use your merchant code (available here) and the date of the request, prefixing them with the length in bytes of each respective value, along with your account’s secret key (for UTF-8 characters the length in bytes might be longer than the string length). For example:

Parameters Type/Description







2010-05-13 12:12:12


192010-05-13 12:12:12


HMAC source string

8AVANGATE192010-05-13 12:12:12




Secret key




Calculated HMAC_SHA256 signature based on MerchantCode and Date, using your secret key:


Request Example 


 * @throws JsonException
function callRPC($Request, $hostUrl)
    $curl = curl_init($hostUrl);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 1);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($curl, CURLOPT_SSLVERSION, 0);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_HTTPHEADER, ['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; // counter for api calls
// call login
$jsonRpcRequest = new stdClass();
$jsonRpcRequest->jsonrpc = '2.0';
$jsonRpcRequest->method = 'login';
$jsonRpcRequest->params = [$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);


Error Description


Authentication failed


Forbidden area


Rate this article:

Need help?

Do you have a question? If you didn’t find the answer you are looking for in our documentation, you can contact our Support teams for more information. If you have a technical issue or question, please contact us. We are happy to help.

Not yet a Verifone customer?

We’ll help you choose the right payment solution for your business, wherever you want to sell, in-person or online. Our team of experts will happily discuss your needs.

Verifone logo