Turn GC ONLINE PLUS into an API

What you can build on ONLINE PLUS

• Check prices and stock for articles

  Build this

  Looks up each article number in the ONLINE PLUS shop and reads the price your account sees and the stock level shown for it.

  Takes

  Article numbers, quantity (optional)

  Returns

  Article number, description, unit, your price, currency, stock level

• Get recent Bestellvorgänge

  Build this

  Reads the Bestellvorgänge (orders) shown under Mein ONLINE PLUS, with the commission each order belongs to.

  Takes

  Placed since (optional), commission (optional)

  Returns

  Order number, order date, commission, items, total

• Get Wareneingänge and Angebote

  Build this

  Reads the Wareneingänge (goods receipts) and Angebote (offers) listed under Mein ONLINE PLUS, one list or both.

  Takes

  Which list (Wareneingänge, Angebote or both), since (optional)

  Returns

  Type, number, date, commission, items, total

• Fill a commission cart

  Build this

  Adds articles and quantities to a kommissionsbezogener Warenkorb (commission cart) and leaves it unsent, ready for someone to check and submit.

  Takes

  Commission name, article numbers with quantities

  Returns

  Commission, cart lines, line prices, cart total

Automate ONLINE PLUS 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 price and stock check for a job's material list

  Build this

  Starts

  Every weekday at 6:30

  Step 1

  Check prices and stock for every article on the material list you keep for a job.

  Step 2

  Keep the articles whose price or stock level changed since the last run.

  Step 3

  Email you the list with article number, old and new price, and stock level.

• The day's Wareneingänge, posted to your office software

  Build this

  Starts

  Every weekday at 17:00

  Step 1

  Get the Wareneingänge listed under Mein ONLINE PLUS since this morning.

  Step 2

  Stop when there are none.

  Step 3

  Post number, date, commission, items and total to your office software's webhook.

• New Angebote each week, grouped by commission

  Build this

  Starts

  Every Monday at 7:00

  Step 1

  Get the Angebote listed under Mein ONLINE PLUS.

  Step 2

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

  Step 3

  Group them by commission and email you each offer's number, date, items and total.

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 prices and stock for articles” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "gconlineplus.de/check_prices_and_stock",
    "input": {
      "articles": [
        {
          "article_number": "4711023",
          "quantity": 10
        },
        {
          "article_number": "5520418",
          "quantity": 2
        }
      ]
    }
  }'

{
  "status": "completed",
  "data": {
    "articles": [
      {
        "article_number": "4711023",
        "description": "Pressfitting Bogen 90°, Kupfer, 22 mm",
        "unit": "Stück",
        "price": 4.86,
        "currency": "EUR",
        "stock_level": 340
      }
    ],
    "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.

ONLINE PLUS’s own options

GC-GRUPPE connects installers' trade software to its shop through standard trade interfaces: IDS for carts and orders, OCI for filling carts, UGL for documents along the order process, and DATANORM or OPEN MASTERDATA for article data. GC's interfaces page describes no web API you call from your own code, and it names no costs.

Read on November 12, 2026: GC-GRUPPE: Schnittstellen, GC-GRUPPE: GC ONLINE PLUS, GC-GRUPPE: ONLINE PLUS Zugang beantragen.

Signing in to ONLINE PLUS

ONLINE PLUS is for existing GC customers: you request access with your Kundennummer and your GC house, and you sign in before you can order. With Fous you sign in once through ONLINE PLUS's own sign-in with your own account. The login is sealed with AES-256 and never returned by the API, and an expired session is signed back in.

Worth knowing

Access is tied to a customer number and a house

The access request asks for your Kundennummer and the GC house you buy from. DATANORM data is requested on the same form, with the box Ich wünsche Datanorm.

Carts above a limit wait for approval

The Genehmigungs-Workflow sets a spending limit per employee. A cart above it goes to a supervisor for approval, so a cart filled by a method may wait there before it is ordered.

Several commission carts at once

Kommissionsbezogene Warenkörbe stay open side by side until they are submitted or deleted. A method that fills a cart takes the commission as an input.

Prices are the ones your account sees

GC shows prices and stock levels after you sign in, and projects with price references appear under Mein ONLINE PLUS. A method returns the prices your own account sees.

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