Walmart just put a hard stop on an old way third-party apps talk to your Marketplace account. If a repricer, order tool, or inventory sync still runs on Delegated Access keys, that connection has days left.
This is not a soft warning email. It is a cutoff.
What happened (confirmed)
Walmart's Developer Portal says approved Solution Providers lost the ability to create new Delegated Access keys on July 30, 2026. Existing keys keep working until the end of September 2026. After that date, Walmart says all Delegated Access keys stop functioning.
The replacement is OAuth 2.0 through the Walmart App Store in Seller Center. Sellers reconnect by opening Apps, then App Listings, selecting Connect on the provider, and authorizing on the provider's site. Providers migrate sellers by asking them to reauthorize with that Connect button.
Walmart is also removing the Delegated Keys section from the Developer Portal, so screenshot which providers still hold keys before that page disappears. App Store authorizations last 12 months and renew from Connected Apps.
Source: Walmart Developer Portal, "Delegated access authorization" notice (last modified August 3, 2026; checked September 28, 2026). Supporting seller explainers: Ordoro (August 12, 2026) and Ecomsellertool (September 25, 2026).
Why this matters
A dead key does not pause shoppers. It pauses the tools that import orders, push inventory, update prices, and send tracking. Walmart still measures cancellation rate, on-time delivery, valid tracking, and late shipments while your software goes dark.
If orders sit in Created because nothing acknowledged them, or tracking never uploads after you ship, that gap shows up in Seller Performance. Peak is weeks away. You do not want to learn this on October 1 with a full cart.
Who it affects most
• Sellers whose repricers, 3PLs, multichannel tools, or agencies still use Delegated Access keys
• Brands with a mix of App Store apps and old keys who assume "already connected" means safe
• Operators routing Walmart orders into Amazon Multi-Channel Fulfillment or a 3PL, where the whole chain starts with order import
• Anyone who shared their own Developer Portal API keys with a vendor (different issue, still clean that up)
• Teams that ignored provider reconnect emails because the old connection "still worked"
What sellers should do this week
1. List every tool that touches Walmart orders, inventory, prices, listings, or tracking. Include agencies and anything you connected into Amazon's new multichannel Seller Central tools.
2. In the Developer Portal, open the Delegated Keys area and screenshot every Solution Provider key before Walmart removes that section. In Seller Center, open Connected Apps and note what already runs on OAuth.
3. Ask each provider in writing: Delegated Access key, our own API keys, or App Store OAuth? Get a migration date if they are not listed in App Listings yet. Walmart says new provider App Store approval can take three to five weeks, so a provider that has not started will not save you by October 1.
4. Reconnect live apps now: Apps → App Listings → Connect → Authorize. Confirm the app appears under Connected Apps, get written confirmation from the provider, then revoke the old Delegated Access key.
5. Test the boring path before you celebrate. Next seller-fulfilled order should move Created to Acknowledged to Shipped with valid tracking. Change one slow SKU quantity and confirm Seller Center updates. Put each app's 12-month renewal on the calendar.
6. If a connection breaks after September 30, keep orders moving in Seller Center first (acknowledge, ship, upload tracking, inventory file). Then reconnect and ask the provider to backfill the gap. Performance metrics do not wait for IT tickets.
Our take
Walmart is cleaning up how vendors reach your account. That is good security hygiene. The operators who get hurt are the ones who treat API auth like background noise until peak week.
Spend an hour this week. Find the keys. Reconnect the apps that still matter. Kill the ones that do not. October 1 is not a drill.
If Walmart is a real channel, your app stack has to survive the cutoff. CoreTrex will map which integrations still run on Delegated Access, which belong in the App Store, and how to keep order and inventory sync alive through peak. Talk to a strategist.