Get your Westpac Corporate Online data through an API

What you can build on Corporate Online

• Get account balances

  Build this

  Reads the account list under Accounts > View > Accounts for an Office and Group: the previous business day's Closing balance and today's Current and Available balances.

  Takes

  Office, group (optional), date (optional)

  Returns

  Account description, currency, closing balance, current balance, available balance

• Get account transactions

  Build this

  Reads the Transaction list for one account between a start and end date, with each transaction's details and any comments added to it.

  Takes

  Office, account, start date, end date, transaction type (optional)

  Returns

  Date, description, debit or credit, amount, comments

• Get receipts by service type

  Build this

  Reads the Receipts list for an Office and Service type such as DERPS, EFTPOS, RECALL or Inward dishonour, and the transactions behind each Service ID.

  Takes

  Office, service type, start date, end date

  Returns

  Service ID, file ID, date, client reference, amount

• Import a payment file for authorisation

  Build this

  Loads a payment file from your own system at Payments > Create payments > Import file for an Office and reads back any errors and the file's status.

  Takes

  Office, payment file

  Returns

  Errors shown, file status

Automate Corporate Online 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.

• Morning balance report for the treasury team

  Build this

  Starts

  Every weekday at 8:00 Sydney time

  Step 1

  Get the account balances for each Office you name.

  Step 2

  Keep each account's Closing, Current and Available balance.

  Step 3

  Email you one table per Office.

• Yesterday's transactions, posted to your ledger

  Build this

  Starts

  Every weekday at 7:30 Sydney time

  Step 1

  For each account you name, get the account transactions dated the previous business day.

  Step 2

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

  Step 3

  Post date, description, debit or credit, amount and comments to your ERP webhook.

• New Inward dishonour and DERPS receipts

  Build this

  Starts

  Every weekday at 9:00 Sydney time

  Step 1

  Get receipts for the Inward dishonour and DERPS service types since yesterday.

  Step 2

  Keep the ones not there on the last run, and stop when there are none.

  Step 3

  Email you each one with its Service ID, Client reference and amount.

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 account balances” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "online.corp.westpac.com.au/get_account_balances",
    "input": {
      "office": "Acme Head Office",
      "group": "Operating accounts"
    }
  }'

{
  "status": "completed",
  "data": {
    "office": "Acme Head Office",
    "group": "Operating accounts",
    "date": "2026-11-12",
    "accounts": [
      {
        "account_description": "Acme Operating Account",
        "currency": "AUD",
        "closing_balance": 1284310.55,
        "current_balance": 1301977.2,
        "available_balance": 1296977.2
      }
    ],
    "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.

Corporate Online’s own options

Westpac connects corporate systems through iLink, which integrates directly with ERP systems such as SAP and Oracle, and through SWIFT for Corporates, both arranged with your product specialist. Its PaymentsPlus API covers payments on a PaymentsPlus facility. For Corporate Online itself, Westpac documents CSV exports on demand, overnight exports and PDF reports, not an API.

Read on November 12, 2026: Connecting with Westpac, PaymentsPlus API documentation, Corporate Online Overview (PDF).

Signing in to Corporate Online

Corporate Online signs you in with your 8-digit Customer No. and password. A token (RSA SecurID or an eToken in the Westpac One app) is needed for Administration, Online FX and authorisers. With Fous you sign in once through Corporate Online's own sign-in with your own customer number: the login is sealed with AES-256, and for a user without a token an expired session is signed back in.

Worth knowing

A user who only reads needs no token

Each staff member is a separate user with their own customer number. A token is needed only for Administration, Online FX or authorising, so a user who views and exports signs in with customer number and password.

History runs for 24 months

Balances, transactions and payment history accumulate for up to 24 months, and export files and PDF reports can be downloaded for 100 calendar days. Account statements are kept as PDF for up to 7 years.

An imported file still needs authorising

After import a file stays Unauthorised or Partially authorised until another user with authority signs in and authorises it. A file with a basic error is fixed in your own system and imported again.

Daily cut-off times

Australian Direct Entry files have a 6.00pm AEST/AEDT cut-off and PPS files 5.00pm. You can ask for an Australian Direct Entry file to be processed for the same value date after the cut-off.

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