Get your WEXOnline transactions and invoices through an API

What you can build on WEXOnline

• Get a driver's transactions

  Build this

  Finds a driver under Cards, View Driver, selects View Transactions and reads the transactions for the 30-day period shown.

  Takes

  Driver name or driver ID, period end date (optional)

  Returns

  Date, card, vehicle, merchant, product, quantity, amount

• Run an exception report

  Build this

  Builds a report under Transactions, Add Exception Report for one account, by date, driver, card, vehicle, merchant, product or department, or a common exception.

  Takes

  Account, date range, common exception (optional), driver or department (optional)

  Returns

  Exception, date, driver, card, vehicle, merchant, product, quantity, amount, department

• List invoices

  Build this

  Reads the invoice list under Payments, View Invoices, newest first, using the Advanced Search Filter when you ask for a date or an invoice.

  Takes

  Invoice date from (optional), invoice number (optional)

  Returns

  Invoice number, invoice date, account, amount due, due date

• Suspend or terminate a fuel card

  Build this

  Finds a card under Cards, View Cards, selects Change Status, picks Suspended or Terminated in New Status on Card Details and applies it.

  Takes

  Card number (last digits) or vehicle, new status

  Returns

  Card, vehicle or driver, previous status, new status

Automate WEXOnline 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.

• Fuel exceptions from yesterday, every weekday

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  Run the exception report for yesterday for multiple daily purchases and fuel grade.

  Step 2

  Stop when there are no rows.

  Step 3

  Email you the rows, grouped by driver, with card, merchant, product and amount.

• New WEX invoices, posted to accounts payable

  Build this

  Starts

  Every weekday at 8:00

  Step 1

  List the invoices under Payments, View Invoices.

  Step 2

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

  Step 3

  Post invoice number, invoice date, account, amount due and due date to your accounting webhook.

• Weekly fuel spend by driver

  Build this

  Starts

  Every Monday at 6:00

  Step 1

  For each driver you name, get the transactions from the last 7 days.

  Step 2

  Total the amount and quantity per driver, and mark merchants that are new for that driver.

  Step 3

  Email you the summary and post the totals to your 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 a driver's transactions” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "go.wexonline.com/get_driver_transactions",
    "input": {
      "driver": "D1042",
      "period_end": "2026-11-11"
    }
  }'

{
  "status": "completed",
  "data": {
    "driver": "D1042",
    "period": {
      "from": "2026-10-13",
      "to": "2026-11-11"
    },
    "transactions": [
      {
        "date": "2026-11-10",
        "card": "****4417",
        "vehicle": "Van 12",
        "merchant": "Northwind Fuel, Columbus OH",
        "product": "Unleaded Regular",
        "quantity": 18.4,
        "unit": "gal",
        "amount": 59.62
      }
    ],
    "count": 1,
    "currency": "USD"
  }
}

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.

WEXOnline’s own options

WEX documents a Fleet Management API for accounts, cards, drivers, vehicles, sites and the payment of WEX statements. It is described as a platform for partners and large fleets: you onboard through your WEX account team, which issues the credentials and a testing environment. In WEXOnline itself, the invoice list and driver transactions export to CSV or Excel.

Read on November 12, 2026: WEX Fleet Management API, Fleet Management API: getting started, WEX fleet accounts support.

Signing in to WEXOnline

WEXOnline signs you in with the email address on your account and your existing password. If you only know your old username, the sign-in page lets you enter it with your password to find the email. With Fous you sign in once through WEXOnline's own sign-in with your own account, and the login is sealed with AES-256, never returned by the API or written to logs. When the session expires, Fous signs back in.

Worth knowing

Suspended can be undone, Terminated cannot

A card's New Status can be Suspended or Terminated. WEX suggests Suspended first for a lost card, because it can be reactivated, while Terminated is permanent.

Driver transactions come 30 days at a time

View Transactions under a driver shows a 30-day period. For longer ranges, or for several drivers at once, the exception report under Transactions searches by date, driver, card, vehicle, merchant, product or department.

Purchase controls live in authorization profiles

Each card uses an authorization profile, either Fuel Only or Custom Control, listed under Cards, View Auth Profiles. A new card gets its profile under Card Information when you add it.

API payments are for Direct Fleet

In WEX's Fleet Management API, managing bank accounts and paying WEX statements is limited to Direct Fleet accounts. Access to the API goes through your WEX account team.

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