PHP ActiveX Requires Chilkat v11.0.0+

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

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

<?php

$success = 0;

//  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 COM("Chilkat.CkDateTime");
//  Set bLocal = 1 for a timestamp in the local timezone.  Set bLocal = 0 for a UTC timestamp.
$bLocal = 0;
//  This gets the timestamp in seconds, not milliseconds.
$timeStampVal = $dt->GetAsUnixTime($bLocal);

//  Build the string to sign.
$sbStringToSign = new COM("Chilkat.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 COM("Chilkat.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.
$success = $privKey->LoadPem($privateEncodedStr);
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

$rsa = new COM("Chilkat.Rsa");
$success = $rsa->UsePrivateKey($privKey);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

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

$signatureString = $rsa->signStringENC($sbStringToSign->getAsString(),'SHA256');
if ($rsa->LastMethodSuccess == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

print 'Signature String: ' . $signatureString . "\n";

?>