Resolving Walmart API Item Feed Error: Invalid Request Content

Resolving Walmart API Item Feed Error: Invalid Request Content

Have you encountered the ‘INVALID_REQUEST_CONTENT’ error while trying to upload an item to Walmart’s API? This error can be frustrating, but fret not – we have some valuable insights and solutions to help you troubleshoot this issue effectively. Let’s delve into common reasons for this error and explore potential solutions that can get you back on track with your API integration.

Troubleshooting INVALID_REQUEST_CONTENT Error When Uploading to Walmart’s API

The INVALID_REQUEST_CONTENT error you’re encountering while uploading an item to Walmart’s API can be quite frustrating. Let’s troubleshoot this issue together.

Here are some common reasons for this error and potential solutions:

  1. Payload/Data Format:

    • The error message suggests that the content you’re sending is invalid. Double-check the payload format you’re using. Ensure that it adheres to Walmart’s API specifications.
    • Verify that your data is correctly structured, including all required fields. Sometimes a missing or incorrectly formatted field can trigger this error.
  2. Content-Type Header:

    • Make sure you set the Content-Type header correctly in your request. For item feeds, it should be multipart/form-data.
    • Additionally, ensure that the boundary specified in the Content-Type header matches the actual boundary used in your data.
  3. Accept Header:

    • While the error message doesn’t explicitly mention it, the Accept header can also cause issues. Set it to application/json for better compatibility with Walmart’s API.
  4. Authentication and Signature:

    • Check your authentication process. Ensure that you’re signing the request correctly using your Walmart Consumer ID and Private Key.
    • Verify that the timestamp and other parameters match the expected values.
    • If you’re using OpenSSL for signing, ensure that the private key is correctly loaded and the signature algorithm (SHA-256) is consistent.
  5. Boundary Issue:

    • The error message “Couldn’t determine the boundary from the message!” indicates a problem with the multipart boundary.
    • Ensure that the boundary specified in the Content-Type header matches the one used in your data payload.
  6. Malformed Data:

    • The second error message, “Malformed data,” suggests that there might be issues with the data you’re sending.
    • Validate your XML or JSON data to ensure it’s well-formed and follows the expected structure.

Here’s a snippet of your code for reference:

$URL = '';
$RequestMethod = 'POST';
$Timestamp = round(microtime(true) * 1000);
$WalmartConsumerID = 'your_consumer_id'; // Replace with your actual Consumer ID

// Your authentication logic here (GetWalmartAuthSignature, ConvertPkcs8ToPem, etc.)

// Construct your headers
$headers = auth($URL, $RequestMethod, $Timestamp, $WalmartConsumerID);

// Read your XML data (e.g., from a file or variable)
$val = file_get_contents('');
// Send your request using appropriate HTTP client (e.g., cURL)

// Handle the response and troubleshoot any further issues

Remember to replace placeholders like your_consumer_id with your actual values. If you’ve tried all the above steps and still face issues, consider reaching out to Walmart’s support for further assistance.

Walmart API Best Practices

When working with the Walmart API

  1. Data Format for Items:

    • The error message suggests that the list of items whose associations you’re trying to fetch is invalid.
    • Ensure that you’re passing the items as objects, not plain numbers.
    • Each item should be in the form { "sku": "your_sku_here" }.
    • For example:
      $fields = [
          'items' => [
              ['sku' => '123456'],
              ['sku' => '778990']
    • Replace the placeholders with your actual SKUs.
  2. WM_SVC.NAME Header Parameter:

    • Double-check the value of the WM_SVC.NAME header parameter.
    • Make sure it matches the expected format: "Walmart Marketplace".
  3. Authorization and Token:

    • Verify that your authorization key and access token are correctly set.
    • Ensure that you’re using the correct credentials for making the API request.

Troubleshooting Walmart API Error Message INVALID_REQUEST_CONTENT

The error message “INVALID_REQUEST_CONTENT” from the Walmart API indicates that there might be an issue with the request parameters. Let’s troubleshoot this together:

  1. Check Query Parameters: Double-check the query parameters you are sending in the request payload. Ensure that they are correctly formatted and match the expected structure according to the Walmart API documentation.

  2. Data Format: Make sure that the data you’re sending (such as the list of items) adheres to the required format. For example, when fetching item associations, the items should be represented as objects with a “sku” field, rather than plain numbers.

  3. Headers: Verify the headers you’re including in your request. Specifically, check the following:

    • WM_SVC.NAME: Ensure that the value for this header is set to “Walmart Marketplace.”
    • WM_QOS.CORRELATION_ID: Use a unique identifier for each request.
    • Authorization: Include the appropriate authorization key.
    • WM_SEC.ACCESS_TOKEN: Provide a valid access token.
    • Accept: Set the content type to “application/json.”

Here’s an example of how you might structure your request:

$url = "";
$ch = curl_init();
$qos = uniqid();

$fields = [
    'items' => [
        ['sku' => '123456'],
        ['sku' => '778990']

$options = [
    CURLOPT_URL => $url,
    CURLOPT_HEADER => false,
        "WM_SVC.NAME: Walmart Marketplace",
        "WM_QOS.CORRELATION_ID: $qos",
        "Authorization: Basic $authorization_key",
        "WM_SEC.ACCESS_TOKEN: $token",
        "Accept: application/json",
    CURLOPT_POSTFIELDS => json_encode($fields),

curl_setopt_array($ch, $options);
$response = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);

$response = json_decode($response, true);

Remember to replace placeholders like $authorization_key and $token with actual values. If you follow these steps and still encounter issues, consider reviewing the API documentation or reaching out to Walmart support for further assistance.

Best Practices for Data Quality and Validation in Walmart API Integrations

Ensuring data quality and validation in Walmart API integrations is crucial for accurate and reliable interactions with the platform. Here are some best practices:

  1. Establish Clear Standards for Data Quality:

    • Define measurable criteria for data quality. This includes accuracy, completeness, consistency, and timeliness.
    • Set clear expectations for data quality at the source level to prevent errors from propagating downstream.
  2. Validate Data Close to the Source:

    • Perform data validation as close to the point of origin as possible. This minimizes the chances of incorrect or incomplete data entering the system.
    • Implement validation checks during data ingestion, transformation, and loading processes.
  3. Leverage Automated Tools:

    • Use automated validation tools whenever feasible. These tools can efficiently check data against predefined rules and business logic.
    • Implement schema validation, type checks, and business rule validations to catch discrepancies early.
  4. Monitor Data Quality Metrics:

    • Regularly monitor data quality metrics to identify anomalies or issues.
    • Set up alerts for data quality deviations and take corrective actions promptly.

For more detailed information, you can explore the Walmart Developer Portal, which provides comprehensive documentation and tools for API integration.

Exploring Walmart’s API Integration Options

If you’re looking to integrate with Walmart’s APIs, there are several options available for different types of partners and developers. Let’s explore them:

  1. Marketplace Sellers and Suppliers:

    • Marketplace sellers and supplier developers can access API tools and documentation to integrate with the Walmart eCommerce platform. Whether you’re a Drop Ship Vendor (DSV) or a Marketplace Seller, you’ll find the necessary resources to manage items, orders, prices, inventory, and more using Marketplace APIs.
    • Supplier APIs allow Walmart 1P Suppliers (those who sell directly to Walmart) to manage their items, orders, inventory, and other aspects of their business.
  2. Content Service Providers:

    • These providers assist suppliers in setting up their catalogs with Walmart. They help create enriched content, provide API integration, and act as a bridge between suppliers and Walmart.
  3. Advertising Partners:

    • Advertising Partners work with Walmart Connect’s Ads APIs. They manage ad campaigns, optimize performance, and retrieve on-demand metrics for advertisers (sellers and suppliers) on Walmart’s platform.
  4. Walmart Commerce Technologies (WCT) Clients and Partners:

    • These clients and partners can integrate with Store Assist and other APIs. Store associates use these APIs to prepare and have orders ready for handoff through the Store Assist app.
  5. API Documentation and Tools:

    • The Walmart Developer Portal provides comprehensive tools for partners:
      • API Status Checker: Verify the status of all APIs.
      • Try It Out: Test API calls directly in the browser and view responses.
      • API Sandbox: Test APIs on the backend.
      • API Documentation: Access how-to guides, API references, and FAQs.
      • XSDs: Learn about product XSDs.
      • API Explorer: Test your APIs.
  6. Stay Updated:

    • To keep up with the latest offerings from the Walmart API Developer Portal, visit the What’s New page.

For more details and to get started, visit the Walmart Developer Portal.

In conclusion, the ‘INVALID_REQUEST_CONTENT’ error in the Walmart API item feed can pose challenges, but armed with the right knowledge and troubleshooting steps, you can overcome it successfully. By ensuring data quality, validating parameters, and leveraging the wealth of resources provided by Walmart’s Developer Portal, you can streamline your API integration process and enhance your interaction with the platform. Remember to follow best practices for data validation, seek assistance when needed, and stay informed about updates from Walmart’s API ecosystem.

With persistence and attention to detail, you can navigate the complexities of the Walmart API landscape and achieve your integration goals effectively.


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