Merchant Feed Audit diagnostic order

Problem:
Google Merchant Center, marketplace feeds, affiliate feeds, and commerce agents can flag or weaken product data when the submitted feed and the public product page disagree. The hard part is often not the fix; it is deciding which layer to inspect first.

Fast diagnostic order:

1. Feed row
- Submitted price, sale price, currency, availability, item id, and product link.
- Variant-specific URLs matter: the feed row should point to the public variant/page whose visible price matches the submitted row.

2. Landing page visible state
- First visible price seen by an anonymous crawler.
- Default variant, sale/compare-at presentation, subscription widgets, geo/currency redirects, and out-of-stock messaging.

3. Machine-readable page signals
- Product/Offer JSON-LD price, priceCurrency, availability, and URL.
- Open Graph product price tags.
- Microdata/meta price and currency.
- Canonical URL, robots reachability, and noindex.

4. Timing and sync
- Recent feed sync, theme/app change, price update, market/currency update, or crawler recrawl delay.

Where Devryno fits:
Devryno Merchant Feed Audit fetches a public Google Merchant/RSS/Atom/CSV/TSV product feed, parses up to 10 rows, and compares feed price/currency/availability with the public product-page signals above. It returns JSON evidence and a row-level match/mismatch verdict.

Paid check:
- Checkout: https://devryno.com/buy/merchant-feed-audit
- Free feed preview: https://devryno.com/free/merchant-feed-preview?url=https%3A%2F%2Fdevryno.com%2Fexamples%2Fgoogle-merchant-feed.xml&limit=2
- Quote API: https://devryno.com/quote/merchant-feed-audit?url=https%3A%2F%2Fdevryno.com%2Fexamples%2Fgoogle-merchant-feed.xml&limit=2
- Claim API: https://devryno.com/claim/merchant-feed-audit?url={public-product-feed-url}&limit={1-10}&tx={base-transaction-hash}
- x402 API: https://devryno.com/pay/merchant-feed-audit?url={public-product-feed-url}&limit={1-10}
- Price: 0.25 USDC on Base per audit.

Public context links:
- Google price/feed/landing mismatch docs: https://support.google.com/merchants/answer/9773429?hl=en-GB
- Google structured data setup docs: https://support.google.com/merchants/answer/7331077?hl=en
- Google automatic item updates docs: https://support.google.com/merchants/answer/12157888?hl=en
- Shopify Community diagnostic-order question: https://community.shopify.com/t/when-gmc-shows-a-price-mismatch-warning-how-do-you-actually-figure-out-what-to-check-first/599658
- Stack Overflow currency mismatch case: https://stackoverflow.com/questions/72690344/mismatched-value-page-crawl-price
- Shopify subscription/default-price case: https://community.shopify.com/t/shopify-product-page-google-merchant-center-price-mismatch-error/312168

Important:
Devryno is not affiliated with Google or Shopify. This is a public preflight over public feed/page evidence; it does not guarantee approval.