This is a Ruby on Rails sample that demonstrates integrating with QuickBooks using OAuth 2.0 to:

• Fetch custom Dimensions (definitions and values) via GraphQL
• Create an Invoice with a selected Dimension value It ships with a minimal UI at / implementing a multi-step workflow.

• OAuth 2.0 authentication with QuickBooks
• Fetch custom Dimensions (definitions and values) via GraphQL endpoint
• Create Invoice with a custom Dimension value
• Minimal UI workflow at /

• Ruby 3.4.7
• Rails 8.x
• QuickBooks Online developer account and IES company for API access(Kindly note that the IES company requires defined dimensions and customers in order to complete the process.).
• ngrok (for local development HTTPS callback)

1. Clone or download the repository:

git clone <repository-url>
cd SampleApp-Dimensions-Ruby

2. Install dependencies

bundle install

3. Configure environment

• Copy .env.example to .env and set real values

cp .env.example .env

Required variables:

QB_CLIENT_ID=your_actual_client_id
QB_CLIENT_SECRET=your_actual_client_secret
QB_REDIRECT_URI=https://your-ngrok-url.ngrok-free.app/callback
QB_ENVIRONMENT=sandbox   # or production

4. Expose your dev server via ngrok

If this is your first time using ngrok:

Sign up / log in at https://ngrok.com and download/install ngrok for your OS.

From your ngrok dashboard, copy your Auth Token.

Run the following once to configure ngrok locally (replace with your token):

ngrok config add-authtoken YOUR_NGROK_AUTH_TOKEN

Then, in a separate terminal window, start ngrok on the Rails port:

ngrok http 5036

• ngrok will show an HTTPS forwarding URL, e.g. https://abc123.ngrok-free.app.
• Use this HTTPS URL as the base for QB_REDIRECT_URI and in your QuickBooks app settings.
• The redirect path must end with /callback, e.g. https://abc123.ngrok-free.app/callback.

5. Run the app

bin/rails server

Note: If you encounter a permission denied error during this step, try running the app using the following command:

bundle exec rails server

Configure your QuickBooks app:

• Go to Intuit Developer Portal
• Create a new app or use an existing one
• Enable Accounting and Custom Dimensions API scopes
• Add your redirect URI (e.g., https://your-ngrok-url.ngrok-free.app/callback)

The app uses the following scopes (see QuickbooksOauthService):

• com.intuit.quickbooks.accounting
• app-foundations.custom-dimensions.read

1. Visit http://localhost:5036 in your browser
2. Step 1: Connect to QuickBooks - Click "Connect to QuickBooks" to authenticate via OAuth 2.0
3. Step 2: Fetch Dimensions - Click "Fetch Dimensions" to load available custom dimension definitions
4. Step 3: Create Invoice - Enter amount, select a customer and item, choose a dimension and value, then click "Create Invoice"

Visit:

• UI: http://localhost:5036/

• / – Minimal UI with the multi-step workflow
• /qbo-login – Initiates OAuth flow
• /callback – OAuth callback handler
• /datafetch – POST; loads dimensions into session
• /get_dimension_values/:dimension_id – GET; returns JSON of values for a dimension
• /create_invoice – POST; creates an invoice
• /logout – Clears session

• rails (~> 8.0.3) Full-stack web framework (routing, controllers, views, etc.).

• puma (>= 5.0) HTTP server that runs the Rails app.

• propshaft Modern Rails asset pipeline for serving CSS/JS/images.

• importmap-rails Loads JavaScript modules via ESM without Node/bundlers.

• graphql (~> 2.5) GraphQL gem used internally to structure requests; no public /graphql endpoint is exposed.

• faraday (~> 2.14) HTTP client for calling QuickBooks APIs.

• dotenv-rails (~> 3.1) Loads environment variables from .env in development.

• tzinfo-data (Windows/JRuby only) Time zone data for platforms lacking system zoneinfo.

• Ruby 3.4.7 Project Ruby version (.ruby-version).

• ngrok (external tool) Used to expose a public HTTPS URL for OAuth callbacks in development.

• The app issues GraphQL calls to Intuit endpoints internally (see app/services/quickbooks_api_service.rb).
• Use the UI flow for primary functionality,there is no public /graphql route.

• OAuth and API services:
  • app/services/quickbooks_config.rb
  • app/services/quickbooks_oauth_service.rb
  • app/services/quickbooks_api_service.rb
• GraphQL:
  • Controller: app/controllers/graphql_controller.rb (context includes services + session tokens)
• Controllers/UI:
  • Root and minimal UI: HomeController#index, app/views/home/index.html.erb
  • OAuth: AuthController (/qbo-login, /callback)
  • Data: DataController#fetch
  • Dimensions JSON: DimensionsController#values
  • Invoice: InvoicesController#create
  • Logout: SessionsController#logout