PHP Requires Chilkat v11.0.0+

Walmart Partner API Authentication (Generate a Signature for a Request)

See more RSA Examples

Demonstrates how to generate a signature for a Walmart Partner REST API call. Chilkat2 PHP

<?php

use Chilkat2\DateTime;
use Chilkat2\PrivateKey;
use Chilkat2\Rsa;
use Chilkat2\StringBuilder;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$consumerId = 'b68d2a72....';
$baseUrl = 'https://marketplace.walmartapis.com/v2/feeds';
// This is your Base64 encoded private key
$privateEncodedStr = 'MIICeAIBADANBgkqhkiG9w0BAQEFAA......';
$httpMethod = 'GET';

// We need a timestamp in decimal string form representing the number of milliseconds since Jan 01 1970 UTC.
$dt = new DateTime();
// Set bLocal = true for a timestamp in the local timezone.  Set bLocal = false for a UTC timestamp.
$bLocal = false;
// This gets the timestamp in seconds, not milliseconds.
$timeStampVal = $dt->GetAsUnixTime($bLocal);

// Build the string to sign.
$sbStringToSign = new StringBuilder();
$sbStringToSign->Append($consumerId);
$sbStringToSign->Append("\n");
$sbStringToSign->Append($baseUrl);
$sbStringToSign->Append("\n");
$sbStringToSign->Append($httpMethod);
$sbStringToSign->Append("\n");
$sbStringToSign->AppendInt($timeStampVal);
// We add three zero's so that the timestamp value is in milliseconds.
// We don't care about accuracy down to less than a second.
// All the server cares about is that the request was signed at the current date/time
// within some reasonable margin of error (to account for systems having clocks
// that may be slightly different).
$sbStringToSign->Append("000\n");

$privKey = new PrivateKey();
// Load the private key into a private key object.
// Note: Technically the private key is not PEM because it lacks the header/footer strings
// used for PEM.  However, the LoadPem method will still accept it and load it correctly.
try {
    $privKey->LoadPem($privateEncodedStr);

    $rsa = new Rsa();
    $rsa->UsePrivateKey($privKey);

    // We want a base64 signature string.
    $rsa->EncodingMode = 'base64';

    $signatureString = $rsa->SignStringENC($sbStringToSign->GetAsString(), 'SHA256');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'Signature String: ', $signatureString, "\n";