Turn Walmart Seller Center into an API

What you can build on Seller Center

• Get payment transactions

  Build this

  Searches the Transactions tab of the Payments dashboard by PO#, CO#, transaction type or date, with each transaction's status.

  Takes

  Date range, transaction type (optional), status (optional), PO# or CO# (optional)

  Returns

  PO number, customer order number, transaction type, status, date, order total revenue

• Check seller performance metrics

  Build this

  Reads the Performance dashboard: each metric's current rate, the period it covers and the seller standard it is held to.

  Takes

  Nothing

  Returns

  Metric, current rate, period, seller standard, meets standard

• List your support cases

  Build this

  Opens Your Cases from the question mark icon and reads each case your company created, with its status and latest message.

  Takes

  Status (optional)

  Returns

  Case number, subject, status, created date, last updated, latest message

• Reply to a case that needs info

  Build this

  Opens one case from Your Cases, writes the message you give and selects Send message.

  Takes

  Case number, message

  Returns

  Case number, status, message sent at

Automate Seller Center with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• Performance metrics below the seller standard

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  Check the Performance dashboard for every metric's current rate and seller standard.

  Step 2

  Keep the metrics that do not meet their standard, and stop when there are none.

  Step 3

  Email you each metric with its rate, period and standard.

• Settled transactions, posted to your accounting system

  Build this

  Starts

  Every Monday at 8:00

  Step 1

  Get the transactions from the Transactions tab for the past 7 days with status Settled.

  Step 2

  Keep the transactions that were not there on the last run.

  Step 3

  Post PO number, order number, transaction type, date and order total revenue to your webhook.

• Support cases that need your answer

  Build this

  Starts

  Every weekday at 9:00

  Step 1

  List the support cases in Your Cases with status Needs info.

  Step 2

  Keep the cases that were not in Needs info on the last run.

  Step 3

  Post each case's number, subject, last updated date and latest message to your Slack webhook.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get payment transactions” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "seller.walmart.com/get_payment_transactions",
    "input": {
      "from": "2026-11-02",
      "to": "2026-11-08",
      "status": "Settled"
    }
  }'

{
  "status": "completed",
  "data": {
    "transactions": [
      {
        "po_number": "4021938817",
        "customer_order_number": "200118734455102",
        "transaction_type": "Sale",
        "status": "Settled",
        "date": "2026-11-03",
        "order_total_revenue": 41.85,
        "currency": "USD"
      }
    ],
    "count": 1
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

Seller Center’s own options

Walmart's Marketplace APIs manage items, inventory, orders, pricing, promotions and reports, including a settlement report, and Seller Performance APIs return your metrics. You call them with a Client ID and Client Secret from the Developer Portal. Support cases are opened and answered in Seller Center's Help panel.

Read on November 12, 2026: Introduction to Walmart Marketplace APIs, Payment statements and transactions, Seller Performance Standards: Overview.

Signing in to Seller Center

Seller Center has its own sign-in page, with Contact Support below the login box for password problems. It is separate from the Client ID and Client Secret the APIs use. With Fous you sign in once through Seller Center's own sign-in with your own account: the login is sealed with AES-256, never returned by the API or written to logs, and code and AI agents never see it.

Worth knowing

Transactions go back 90 days

The Transactions tab searches transactions for orders created in the past 90 days. For older pay cycles, use the Statements view and its Payments Report.

Balances update 24 to 48 hours later

Balances update about 24 to 48 hours after an order is marked Shipped or delivered. Deferred transactions wait on delivery under the Delivery Date Payment Policy, then move to Pending or Settled.

Commission and Referral Fee are the same

The Payments Report says Commission where the Marketplace Retailer Agreement says Referral Fee. The report comes in a summarized new version and a detailed legacy version.

Metrics cover 30 or 60 days

Seller Performance Standards are evaluated over the last 30 or 60 days. With Walmart Fulfillment Services, most metrics are met for you, except the Negative Feedback Rate.

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