Turn the Workday supplier portal into an API

What you can build on the Supplier Portal

• Get purchase orders

  Build this

  Reads Most Recent Purchase Orders on the POs and Catalogs dashboard for one customer, searched by document date or purchase order number.

  Takes

  Customer, document date from (optional), PO number (optional)

  Returns

  PO number, document date, status, buyer, total, uninvoiced amount, currency

• Check invoice statuses

  Build this

  Reads Most Recent Invoices on the Invoices and Payments dashboard for one customer, searched by due date, invoice number, invoice status or payment status.

  Takes

  Customer, invoice status (optional), due date from (optional)

  Returns

  Invoice number, supplier's invoice number, invoice date, due date, invoice status, payment status, total

• Get payments

  Build this

  Reads Most Recent Payments on the Invoices and Payments dashboard for one customer: what was paid, by which payment type and with which reference.

  Takes

  Customer, payment date from (optional)

  Returns

  Payment date, payment type, payment status, currency, amount, supplier reference number, transaction reference

• Create an invoice from a purchase order

  Build this

  Runs Create Invoice from Purchase Order: picks a PO with an uninvoiced amount, fills in the invoice, attaches the PDF on the Attachments tab and submits it.

  Takes

  Customer, PO number, supplier's invoice number, invoice date, control total amount, invoice PDF

  Returns

  Invoice number, status, PO number, control total amount

Automate the Supplier Portal 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.

• New purchase orders from every customer

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  For each customer you name, get the purchase orders dated in the last 7 days and keep those in Issued status.

  Step 2

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

  Step 3

  Email you the list, one section per customer.

• Invoice status changes, posted to your ERP

  Build this

  Starts

  Every weekday at 9:00

  Step 1

  For each customer, check Most Recent Invoices with their invoice status and payment status.

  Step 2

  Keep the invoices whose invoice status or payment status changed since the last run.

  Step 3

  Post each one, with its supplier's invoice number and total, to your ERP or Slack webhook.

• Payments received, handed to accounting

  Build this

  Starts

  Every day at 18:00

  Step 1

  For each customer, get Most Recent Payments from the last 2 days.

  Step 2

  Keep the payments that were not there on the last run, and stop when there are none.

  Step 3

  Post date, payment type, amount, currency and references to your accounting 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 purchase orders” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "myworkday.com/get_purchase_orders",
    "input": {
      "customer": "Acme",
      "document_date_from": "2026-11-01"
    }
  }'

{
  "status": "completed",
  "data": {
    "customer": "Acme",
    "purchase_orders": [
      {
        "po_number": "PO-0031842",
        "document_date": "2026-11-10",
        "status": "Issued",
        "buyer": "Procurement Services",
        "total": 4260,
        "uninvoiced_amount": 4260,
        "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.

The Supplier Portal’s own options

Each customer sets up the Supplier Portal in its own Workday: it creates your account and chooses which dashboards and worklets you see. Workday's supplier documentation describes the portal in the browser and no API for supplier accounts. With the Unified Supplier Portal, one Workday Central Login account reaches every customer that grants you access.

Read on November 12, 2026: Concept: Unified Supplier Portal for Suppliers, Set Up the Supplier Portal, Concept: Supplier Portal.

Signing in to the Supplier Portal

Suppliers sign in through Workday Central Login with an email address, a password and multifactor authentication by authenticator app or SMS, which is required even where SSO is set up. A customer can add an emailed six-digit passcode before its Procurement Portal. With Fous you sign in through Workday's own sign-in with your own account, and the login is sealed with AES-256.

Worth knowing

One customer at a time

You open each customer's Procurement Portal from its profile in the Customer Directory. Customers that have not taken up the Unified Supplier Portal keep their own Supplier Portal, outside the USP.

Your customer decides what you see

Each customer adds or removes worklets on your dashboards, and not every customer enables every app in the USP. A method reads what that customer shows your account.

Uninvoiced amounts count paid invoices only

In one customer's guide, the uninvoiced amount on Uninvoiced POs ignores invoices that are in progress or approved but not yet paid. Read invoice statuses alongside it before invoicing again.

A submitted invoice cannot be edited

After you submit, the invoice shows In Progress and can no longer be edited. You cannot invoice more than the PO's remaining balance.

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