Track your Legal Tracker invoices from your own systems

What you can build on Legal Tracker

• Check posted invoice statuses

  Build this

  Reads the invoices your firm has posted in Legal Tracker, with each one's status and your client's comments.

  Takes

  Client company (optional), posted since (optional)

  Returns

  Invoice number, client company, matter name, firm client number, firm matter number, invoice date, billing period, total, currency, status, client comments

• List the matters you bill to

  Build this

  Reads the matters your firm can see in Legal Tracker, with your own client and matter numbers and whether a matter is flagged incomplete.

  Takes

  Client company (optional)

  Returns

  Matter name, client company, firm client number, firm matter number, incomplete flag

• Post a LEDES invoice to a matter

  Build this

  Uploads one LEDES invoice with LEDES Manual Upload on a matter, chooses the law firm office and currency, and posts it.

  Takes

  Client company, matter, LEDES file, law firm office, currency

  Returns

  Invoice number, matter name, invoice date, total, status

Automate Legal Tracker 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.

• Disputed, reduced, rejected and held invoices, every morning

  Build this

  Starts

  Every weekday at 8:00

  Step 1

  Check the statuses of the invoices your firm posted in the last 90 days.

  Step 2

  Keep the invoices whose status changed since the last run.

  Step 3

  Email you each one with its client company, matter, total, new status and client comments.

• Approved invoices, handed to accounts receivable

  Build this

  Starts

  Every day at 18:00

  Step 1

  Check the statuses of your posted invoices.

  Step 2

  Keep the invoices that became approved since the last run, and stop if there are none.

  Step 3

  Post invoice number, firm client and matter numbers, total and currency to your billing system's webhook.

• Matters to fix before month-end billing

  Build this

  Starts

  Monthly on the 25th at 9:00

  Step 1

  List the matters your firm bills to in Legal Tracker.

  Step 2

  Keep the matters flagged incomplete or missing your firm's client or matter number.

  Step 3

  Email you the list, grouped by client company.

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 “Check posted invoice statuses” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "signon.thomsonreuters.com/check_invoice_statuses",
    "input": {
      "client_company": "Acme",
      "posted_since": "2026-10-01"
    }
  }'

{
  "status": "completed",
  "data": {
    "invoices": [
      {
        "invoice_number": "NW-2026-1187",
        "client_company": "Acme",
        "matter_name": "Acme v. Globex supply dispute",
        "firm_client_number": "40112",
        "firm_matter_number": "40112-0031",
        "invoice_date": "2026-10-31",
        "billing_period": "2026-10-01 to 2026-10-31",
        "total": 18450,
        "currency": "USD",
        "status": "Reduced",
        "client_comments": "Line 14: research time above guideline cap."
      }
    ]
  }
}

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.

Legal Tracker’s own options

Thomson Reuters documents a Billing API for Legal Tracker that posts LEDES invoices with attachments, downloads invoices and attachments, and reads matters. Its documentation is on the Thomson Reuters Developer Portal, where the API permissions page needs a sign-in. In Legal Tracker itself, firms post by hand, by SpeedPost or with the LEDES Generator.

Read on November 12, 2026: Legal Tracker Billing API, Posting invoices: Manual, SpeedPost, LEDES Generator, Invoicing overview.

Signing in to Legal Tracker

Legal Tracker opens from the Thomson Reuters sign-on page, and what each person can post depends on the system role and matter role your firm gives them. With Fous you sign in once through that sign-on page with your own account. The login is sealed with AES-256, and a method reads and does only what your account can.

Worth knowing

Your numbers must match exactly

Your firm's client and matter numbers in Tracker must exactly match your time and billing system, or the invoice will not post. SpeedPost depends on them to find the matter.

One invoice, one matter

You cannot post one invoice to several matters. A SpeedPost file can hold several invoices, each with its own invoice number and its own matter.

Incomplete tasks hold delivery

An invoice posted to a matter with incomplete tasks is saved but held from delivery until those tasks are resolved. A matter flagged incomplete needs its required information before you can post.

Linking a rejected invoice

A new invoice can be linked to a rejected one dated within 90 days of the posting date. Thomson Reuters says linking is not available through the API or SpeedPost.

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