How to change product quantity with Ebay API

There are three options available for updating a live item on eBay.

• ReviseItem
• ReviseFixedPriceItem
• ReviseInventoryStatus

For quickly updating an item’s quantity you may want to use ReviseInventoryStatus as it has some advantages over the others.

• Up to a maximum of 4 items can be updated in a single call.
• Confirmation of the updated quantity is included in the response.

If you are OK with using Composer in your PHP projects I have developed a SDK that simplifies using the eBay API. The example below shows how to use the SDK with ReviseInventoryStatus. The comments in the code should tell you what you will need to change in order for it to work.

<?php
require 'vendor/autoload.php';

use DTSeBaySDKConstants;
use DTSeBaySDKTradingServices;
use DTSeBaySDKTradingTypes;
use DTSeBaySDKTradingEnums;

// Your authorization token associated with the seller's account.
$authToken = 'abcd123';
// The ID of the item you wish to update (Must be a string).
$itemID = '123456789';
// The new quantity (Must be an integer and not a string!).
$quantity = 20;
// The numerical ID of the site that the item was listed on. For example the site ID for ebay.com is 0 and for ebay.co.uk it is 3. A complete list is available from eBay: http://developer.ebay.com/DevZone/XML/docs/Reference/ebay/types/SiteCodeType.html.
$siteID = '0';

$service = new ServicesTradingService(array(
    'authToken' => $authToken,
    'apiVersion' => '899',
    'siteId' => $siteID
));

$request = new TypesReviseInventoryStatusRequestType();
$inventoryStatus = new TypesInventoryStatusType();
$inventoryStatus->ItemID = $itemID;
$inventoryStatus->Quantity = $quantity;
$request->InventoryStatus[] = $inventoryStatus;
$request->ErrorLanguage = 'en_US';
$request->WarningLevel = 'High';

$response = $service->reviseInventoryStatus($request);

if (isset($response->Errors)) {
    foreach ($response->Errors as $error) {
        printf("%s: %sn%snn",
            $error->SeverityCode === EnumsSeverityCodeType::C_ERROR ? 'Error' : 'Warning',
            $error->ShortMessage,
            $error->LongMessage
        );
    }
}

if ($response->Ack !== 'Failure') {
    foreach ($response->InventoryStatus as $inventoryStatus) {
        printf("Quantity for [%s] is %snn",
            $inventoryStatus->ItemID,
            $inventoryStatus->Quantity
        );
    }
}

If you are interested in updating other aspects of an item, for example it’s Title, you will want to use either of the Revise operations as these are designed for updating more fields.

<?php
require 'vendor/autoload.php';

use DTSeBaySDKConstants;
use DTSeBaySDKTradingServices;
use DTSeBaySDKTradingTypes;
use DTSeBaySDKTradingEnums;

// Your authorization token associated with the seller's account.
$authToken = 'abcd123';
// The ID of the item you wish to update (Must be a string).
$itemID = '123456789';
// The new quantity (Must be an integer and not a string!).
$quantity = 20;
// The numerical ID of the site that the item was listed on. For example the site ID for ebay.com is 0 and for ebay.co.uk it is 3. A complete list is available from eBay: http://developer.ebay.com/DevZone/XML/docs/Reference/ebay/types/SiteCodeType.html.
$siteID = '0';

$service = new ServicesTradingService(array(
    'authToken' => $authToken,
    'apiVersion' => '899',
    'siteId' => $siteID
));

$request = new TypesReviseItemRequestType();
$item = new TypesItemType();
$item->ItemID = $itemID;
$item->Quantity = $quantity;
$request->Item = $item;
$request->ErrorLanguage = 'en_US';
$request->WarningLevel = 'High';

$response = $service->reviseItem($request);

if (isset($response->Errors)) {
    foreach ($response->Errors as $error) {
        printf("%s: %sn%snn",
            $error->SeverityCode === EnumsSeverityCodeType::C_ERROR ? 'Error' : 'Warning',
            $error->ShortMessage,
            $error->LongMessage
        );
    }
}

if ($response->Ack !== 'Failure') {
    printf("Quantity for [%s] has been updatednn", $itemID);
}