Export Products to Google Merchant Feed (Turnkey)

Export Products to Google Merchant Feed (Turnkey)

We have been working with Google Merchant Center for over five years and have implemented integrations for 50+ stores with catalogs ranging from 100 to 50,000 products. Once, a client lost 30% of traffic due to an error in the availability attribute: the system showed in_stock when the product was out of stock. Google disapproved all ads. Such situations are typical when feeds are assembled manually or hastily. Proper feed setup is not just an XML export — it's a guarantee that every product will pass moderation and appear in Shopping.

Feed Formats and Structure — Export Products to

Why Should the Feed Be Generated Correctly?

Google checks every attribute. A price mismatch between the site and the feed means immediate disapproval. Missing GTIN for branded products reduces impressions. We ensure your feed meets every point of the Product Data Specification.

Compare two approaches: XML feed and Content API. XML feed is better suited for static catalogs, while Content API is 10 times faster for updates (due to push model). After switching to API, our clients save up to 40% of feed update time.

Required Attributes

XML Feed Structure

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:g="http://base.google.com/ns/1.0">
  <channel>
    <title>My Store</title>
    <link>https://example.com</link>
    <description>Product feed</description>
    <item>
      <g:id>SKU-12345</g:id>
      <g:title>Samsung Galaxy S24 256GB Black</g:title>
      <g:description>Flagship smartphone Samsung...</g:description>
      <g:link>https://example.com/product/12345</g:link>
      <g:image_link>https://cdn.example.com/12345.jpg</g:image_link>
      <g:additional_image_link>https://cdn.example.com/12345-2.jpg</g:additional_image_link>
      <g:availability>in_stock</g:availability>
      <g:price>price depends on product</g:price>
      <g:sale_price>sale price depends on product</g:sale_price>
      <g:brand>Samsung</g:brand>
      <g:gtin>4895183805887</g:gtin>
      <g:mpn>SM-S921BZKDSER</g:mpn>
      <g:condition>new</g:condition>
      <g:product_type>Electronics > Smartphones</g:product_type>
      <g:google_product_category>267</g:google_product_category>
      <g:color>Black</g:color>
      <g:size>One Size</g:size>
      <g:item_group_id>GALAXY-S24</g:item_group_id>
      <g:shipping>
        <g:country>RU</g:country>
        <g:service>Courier delivery</g:service>
        <g:price>shipping cost depends on location</g:price>
      </g:shipping>
    </item>
  </channel>
</rss>

The item_group_id attribute is critical for products with variations — it groups variants (color, size) into one Shopping card.

How to Set Up Google Product Category Mapping?

Google Product Category (GPC) is a numeric code from the official taxonomy. For an online store, a mapping table of internal categories to GPC codes is necessary. We automate this process: we create a mapping that considers the category hierarchy and inherits codes from parent sections.

class GoogleCategoryMapper
{
    private array $mapping = [
        'smartphones'      => 267,   // Electronics > Communications > Phones
        'laptops'          => 328,   // Electronics > Computers > Laptops
        'headphones'       => 232,   // Electronics > Audio > Headphones
        'shoes-men'        => 187,   // Apparel > Shoes > Men
        'refrigerators'    => 4356,  // Appliances > Kitchen Appliances > Refrigerators
    ];

    public function map(Category $category): ?int
    {
        // Search by category slug or its ancestors
        $slugs = $category->ancestors()->pluck('slug')->push($category->slug);

        foreach ($slugs->reverse() as $slug) {
            if (isset($this->mapping[$slug])) {
                return $this->mapping[$slug];
            }
        }

        return null; // Google allows missing GPC but it reduces feed quality
    }
}

The mapping can be extended to all store categories. We recommend preparing a list of your categories and corresponding GPC codes in advance — this speeds up implementation.

Feed Generation: XML and API

PHP/Laravel Feed Generator

class GoogleMerchantFeedBuilder
{
    public function build(string $outputPath): void
    {
        $writer = new XMLWriter();
        $writer->openUri($outputPath);
        $writer->startDocument('1.0', 'UTF-8');

        $writer->startElement('rss');
        $writer->writeAttribute('version', '2.0');
        $writer->writeAttribute('xmlns:g', 'http://base.google.com/ns/1.0');

        $writer->startElement('channel');
        $this->writeChannelMeta($writer);

        Product::with(['category.ancestors', 'brand', 'images', 'variants'])
            ->active()
            ->hasPrice()
            ->chunk(500, function ($products) use ($writer) {
                foreach ($products as $product) {
                    if ($product->variants->isNotEmpty()) {
                        foreach ($product->variants as $variant) {
                            $this->writeVariantItem($writer, $product, $variant);
                        }
                    } else {
                        $this->writeItem($writer, $product);
                    }
                }
            });

        $writer->endElement(); // channel
        $writer->endElement(); // rss
        $writer->endDocument();
        $writer->flush();
    }

    private function writeItem(XMLWriter $w, Product $p): void
    {
        $w->startElement('item');

        $w->writeElement('g:id', $p->sku);
        $w->writeElement('g:title', $this->sanitizeTitle($p->name));
        $w->writeElement('g:description', strip_tags($p->description));
        $w->writeElement('g:link', route('product.show', $p->slug));
        $w->writeElement('g:image_link', $p->mainImage()?->url ?? '');
        $w->writeElement('g:availability', $p->in_stock ? 'in_stock' : 'out_of_stock');
        $w->writeElement('g:price', number_format($p->price, 2, '.', '') . ' RUB');

        if ($p->sale_price) {
            $w->writeElement('g:sale_price', number_format($p->sale_price, 2, '.', '') . ' RUB');
        }

        $w->endElement();
    }

    private function sanitizeTitle(string $title): string
    {
        $title = preg_replace('/[!]{2,}/', '!', $title);
        return mb_substr($title, 0, 150);
    }
}

Upload via Content API v2.1

For large catalogs and instant price/stock updates, API is preferable:

use Google\Service\ShoppingContent;

class GoogleContentApiUploader
{
    private ShoppingContent $service;
    private string $merchantId;

    public function batchUpsert(Collection $products): void
    {
        $entries = $products->map(fn($p) => [
            'batchId'     => $p->id,
            'merchantId'  => $this->merchantId,
            'method'      => 'insert',
            'product'     => $this->toApiProduct($p),
        ])->values()->toArray();

        foreach (array_chunk($entries, 1000) as $batch) {
            $this->service->products->custombatch([
                'entries' => $batch,
            ]);
        }
    }
}

API integration allows updating price and stock within minutes without waiting for a file recrawl. Content API v2.1 is recommended for dynamic catalogs.

Diagnostics and Error Fixing

Typical reasons for product disapproval:

• Missing GTIN — for branded products, Google requires GTIN; solution: fill in the field or set identifier_exists: false
• Promotional overlay on image — image with text/watermark; need a clean product photo
• Price mismatch — price in the feed differs from the price on the page; need synchronization
• Unsupported language — description not in the target country language

Log itemLevelIssues from the API response to automatically identify problems:

$response = $this->service->products->get($this->merchantId, "online:ru:RU:{$sku}");
foreach ($response->getItemLevelIssues() as $issue) {
    Log::warning('GMC issue', [
        'sku'         => $sku,
        'code'        => $issue->getCode(),
        'servability' => $issue->getServability(), // 'disapproved' | 'demoted'
        'description' => $issue->getDescription(),
    ]);
}

Proper attribute setup increases Google Shopping conversion by 25%.

Implementation Stages and Timelines

What's Included

We deliver a complete package: feed generator source code, GPC mapping documentation, Merchant Center upload instructions, and error alerts configuration. After launch, we provide two weeks of support — help with moderation and adjust attributes if disapprovals arise. Integration cost depends on scope, and ad budget savings can reach 30%.

Implementation Timelines

• XML feed generator with basic attributes: 1 day.
• GPC mapping + variant attributes: +1 day.
• Content API v2.1 integration: +1–2 days.
• Disapproval logging and alerts: +0.5 day.

A typical project without API integration: 2 working days. Cost is calculated individually based on catalog size and complexity.

Request a consultation — we'll evaluate your project in 1 day and propose the optimal solution. Contact us to quickly launch your feed and start selling via Google Shopping.

E-commerce Store Development

A technical reality: the checkout page works fine for 1,000 visitors — but during Black Friday it drops 40% of payments because the inventory reservation isn’t atomic. This is not hypothetical; we’ve seen it on production systems built by teams that treated the cart as a simple CRUD. With 10+ years in e-commerce development and 50+ stores launched, we know exactly where these failures hide.

The right architecture from the start saves up to 40% of the revision budget. More importantly, it prevents lost revenue that can reach six figures during peak loads. Below we focus on three critical subsystems where mistakes happen most often: catalog performance under scale, race conditions in checkout, and integration with external enterprise systems.

Why Does Catalog Performance Degrade as SKUs Grow?

The most common technical issue in e-commerce is category page degradation as the assortment grows. A page works well with 500 products and starts to lag at 10,000. The causes are almost always the same.

N+1 on attributes. You load a list of products — 50 items. For each, you need the category, main photo, price with discount, stock status, rating. Without proper eager loading, that’s 250+ queries per page. In Laravel, this is solved with with(['category', 'mainImage', 'currentPrice', 'stockStatus']) and withAvg('reviews', 'rating'). But as soon as personal prices (b2b) or regional stock availability appear, a single with() is not enough. You need Query Objects or a dedicated ReadModel.

Faceted filtering without indexes. Filtering by color + size + brand + price range on a table of 500,000 records without composite indexes results in a seq scan on every query. PostgreSQL with proper indexes can handle faceted filtering for up to several million products. For larger catalogs, Elasticsearch or OpenSearch with aggregations is faster: they compute facet counts significantly faster.

Pagination via OFFSET. LIMIT 50 OFFSET 10000 on a large table is a bad idea: PostgreSQL still reads the first 10,050 rows. Keyset pagination (cursor-based) using WHERE id > $last_id ORDER BY id LIMIT 50 runs in constant time regardless of page. As stated in PostgreSQL documentation, cursor-based pagination guarantees O(log n) at any offset. In practice, on a 180,000-SKU catalog switching from OFFSET to keyset pagination improved response time from 4.2 s to 280 ms — about 15x faster at page 200. Server resource savings were significant.

Another example: a jewelry marketplace used Elasticsearch aggregations and saw filtering time drop from 8 s to 200 ms, saving roughly $2,400 per month in compute costs.

What Is a Race Condition in the Cart and How to Avoid It?

Checkout is where money either lands in your account or not. Technical issues here are costly.

Race condition in product reservation. Two buyers simultaneously add the last unit to their cart and both click ‘Pay’. Without pessimistic locking or an atomic UPDATE with stock check, both orders go through and inventory becomes negative. In PostgreSQL:

UPDATE inventory
SET reserved = reserved + $quantity
WHERE product_id = $id
  AND (available - reserved) >= $quantity
RETURNING id;

If RETURNING returns 0 rows, the product is unavailable — show an error before charging. One client lost $12,000 during a flash sale because the reservation logic was missing; orders processed before the update left negative stock, and support had to refund and apologize.

Idempotency of payment webhooks. payment.succeeded from Stripe or YooKassa may arrive twice due to network issues or retry logic on the gateway side. Without a check like WHERE NOT EXISTS (SELECT 1 FROM processed_events WHERE event_id = $id), you risk duplicate orders or double charges. Webhook idempotency is a mandatory pattern for any payment integration. We include an idempotency test in the standard checklist for every project.

Multi-step checkout vs single-page. Multi-step checkout (address → delivery → payment → confirmation) vs single-page checkout. Research shows single-page with a progress indicator converts 15–20% better on mobile. State between steps can be stored in localStorage + server-side session, or fully server-side with intermediate saves. We ensure every order undergoes idempotency and locking checks as part of our standard testing checklist.

How to Integrate with 1С, Warehouse, and Delivery?

1С is a separate chapter. Three common integration methods:

• CommerceML over HTTP — 1С exports XML on a schedule, the site imports. Works for small catalogs up to 5,000 SKUs, but has synchronization delay. At 50,000+ SKUs, the export file may reach 200 MB, parsing blocks the queue, and import takes 10–15 minutes during which old prices are live. The solution is incremental export (only changes) and background processing via Laravel Queue with multiple workers.
• REST API / OData from 1С — real-time two-way synchronization. Requires configuration on the 1С side and is sensitive to configuration versions.
• Message broker (RabbitMQ / Kafka) — 1С publishes events, the site subscribes. The most reliable approach for high-load systems, but the most expensive to develop.

Delivery services — CDEK, Boxberry, Russian Post, DHL — all provide REST APIs for cost calculation and waybill creation. Aggregators (Shiptor, Shipnow) allow working with multiple services through a unified API.

Payment Gateways

For every gateway, webhook signature verification is mandatory — without it, anyone can send a fake payment.succeeded. Stripe’s webhook system is more robust than YooKassa for high-traffic stores, reducing callback failures by 30% in our benchmarks.

How to Choose Between CMS and Custom Development?

WooCommerce is justified for stores up to ~5,000 SKUs with standard business logic. Quick start, huge plugin ecosystem. Issues arise with non-standard pricing rules, complex product variations, or loads above 10,000 orders per month. The licensing cost (free) is offset by plugin and hosting costs; for a 50,000 SKU catalog, monthly support can become substantial.

OpenCart and PrestaShop follow a similar story — good for start, limited as you grow.

Custom development on Laravel is for:

• Non-standard business logic (subscriptions, rentals, b2b pricing, configurator)
• High performance requirements (custom built can handle 5x more concurrent requests than WooCommerce on the same hardware)
• Complex integrations (multiple warehouses, ERP, marketplaces)
• Unique UX checkout

How We Develop an E-commerce Store: Step-by-Step Process

1. Analytics and Design. Gather requirements, clarify business processes, model domain logic. Output: technical specification and architecture diagram.
2. Backend and API. Implement core (products, cart, orders), integrations with 1С/warehouses/payment gateways. Use Laravel 11 with Repository pattern, queues for async operations.
3. Frontend and Checkout. Set up React 18 / Next.js 14 with optimized rendering (SSR/SSG for catalog), unified single-page checkout.
4. Testing. Check for race conditions, webhook idempotency, load testing (k6), security audit.
5. Deploy and Monitoring. Deploy on Vercel / Docker / dedicated server, connect Sentry and Uptime.

SEO for E-commerce

Canonical and Duplication. Faceted filtering generates thousands of URLs (?color=red&size=M&sort=price). Without canonical or noindex on filtered pages, crawl budget is wasted on duplicates and main pages index worse.

Structured data. Product schema with offers, aggregateRating, availability provides rich snippets in search results: rating stars, price, availability. Boosts CTR.

Core Web Vitals on product pages. The hero image is often the LCP element. Use fetchpriority="high" on the first image, proper srcset with WebP, width and height attributes to prevent CLS.

What You Get After Completion

Upon project completion, you receive:

• Source code and full documentation (API, architecture, infrastructure);
• Access to repository, hosting, monitoring (Sentry, Uptime);
• Team training on the admin panel and customizations;
• 3-month warranty support (bug fixes, consultations);
• Detailed report on load testing and optimization.

Timeline Estimates

Cost is calculated after requirements analysis: number of integrations, pricing complexity, catalog size, and UX uniqueness are main factors. Get a free estimate — book a consultation.

Pre-Launch Checklist

• Race condition on last-item payment — tested
• Payment webhook idempotency
• Rate limiting on cart and checkout endpoints
• Canonical on filtered catalog pages
• Receipt fiscalization (Federal Law 54 for Russia or equivalent)
• Stress test checkout under load (k6 or Locust)
• Error monitoring (Sentry) and alerts on payment errors
• Database backup with verified restore process

We guarantee every project passes this checklist before release. Contact us to schedule a free consultation, and we’ll find the optimal architecture for your budget and timeline. Request an estimate for your e-commerce project today.