Turn GCPay into an API for your pay applications

What you can build on GCPay

• Get applications for payment

  Build this

  Opens each project on the Projects tab and reads the Applications for Payment table: pay application number, dates, status and whether waivers are outstanding.

  Takes

  Project (optional)

  Returns

  Project, pay application #, application date, period to, status, waivers outstanding

• List outstanding lien waivers

  Build this

  Opens the Outstanding icon in the Lien Waivers section of the Dashboard tab and reads the waivers waiting for your signature.

  Takes

  Project (optional)

  Returns

  Project, pay application #, waiver, amount

• Check compliance items on a project

  Build this

  Reads a project's compliance documents and which ones are still red, because the general contractor has not yet verified them.

  Takes

  Project

  Returns

  Project, document, uploaded, verified, expiration date

• Create and save an application for payment

  Build this

  Clicks + CREATE in a project's Applications for Payment section, fills in $ This Period or % Work To Date and Material Stored per line, and saves without submitting.

  Takes

  Project, period to, lines with $ this period or % work to date, material stored

  Returns

  Project, pay application #, period to, items still red in the green box

Automate GCPay 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.

• Lien waivers waiting for a signature, every project

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  List the outstanding lien waivers from the Dashboard tab.

  Step 2

  Stop when there are none.

  Step 3

  Email you the list, one section per project, with pay application # and amount.

• Compliance items still red before you bill

  Build this

  Starts

  Every Monday at 8:00

  Step 1

  For each project you name, check its compliance documents.

  Step 2

  Keep the ones still red or with an expiration date in the next 30 days.

  Step 3

  Email you the list, one section per project.

• Pay application status changes, posted to your accounting

  Build this

  Starts

  Every weekday at 17:00

  Step 1

  Get the Applications for Payment on every project.

  Step 2

  Keep the ones whose status changed since the last run.

  Step 3

  Post project, pay application #, period to and status to your accounting system's 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 applications for payment” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "gcpay.com/get_applications_for_payment",
    "input": {
      "project": "Northwind Medical Office Building"
    }
  }'

{
  "status": "completed",
  "data": {
    "applications": [
      {
        "project": "Northwind Medical Office Building",
        "pay_application_number": 7,
        "application_date": "2026-10-27",
        "period_to": "2026-10-31",
        "status": "Submitted",
        "waivers_outstanding": false
      },
      {
        "project": "Northwind Medical Office Building",
        "pay_application_number": 6,
        "application_date": "2026-09-25",
        "period_to": "2026-09-30",
        "status": "Approved",
        "waivers_outstanding": true
      }
    ]
  }
}

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.

GCPay’s own options

GCPay builds and maintains integrations with the general contractor's ERP: projects, commitments, change orders and compliance documents come in, and approved applications for payment go out for AP processing. Its pages describe no API for subcontractors, who use GCPay at no cost in the browser.

Read on November 12, 2026: GCPay integrations, GCPay for subcontractors, GCPay Resource Center: Subcontractors.

Signing in to GCPay

You sign in to GCPay at gcpay.com/login.do with your own user account. Users are added to a company account and then to each project, with project permissions such as Editor or Lien Officer. With Fous you sign in once through GCPay's own sign-in with your own account: the login is sealed with AES-256, and an expired session is signed back in.

Worth knowing

A submitted AFP cannot be changed

Once a pay application is submitted or approved, you cannot adjust it, and errors go to your general contractor. That is why the create method here saves the AFP without submitting it.

+ CREATE needs an approved schedule of values

The green + CREATE button appears only when your schedule of values is submitted and approved and no pay application exists yet for the project.

Red means not yet verified

Uploaded compliance documents stay red until the general contractor verifies them. The items in an AFP's green box also stay red until each one is resolved.

Permissions are set per project

An Editor can create a schedule of values, AFP or change order. The Lien Waivers tab needs Admin or Lien Officer permissions, and each project has one Designated Signer.

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