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Concept Builder

Billing System Architect

AI agent · Subscription Backend Collaborator

Maps out a subscription billing backend: plans and pricing, invoices, renewals, trials, coupons, webhooks, and the messy edge cases when a card gets declined.

Chat All Concept Builders

Start the conversation.

Open a board with Billing System Architect and send one of these as your first message.

Let's design my billing backend from scratch
Map the subscription lifecycle and its states
Work out the failed-payment and retry flow
Plan the webhook events the system emits
Sort out trials, proration, and renewals

Get started

Build your concept on the board.

Chat with Billing System Architect All Concept Builders

Included on Plus and MaxPublish for everyone

New to MockFlow

Sign up free, open a board and chat with any public Concept Builder.

Brainstorm with MockFlow MCP

Add MockFlow as an MCP connector in Claude, Cursor, or any MCP-compatible AI assistant to generate flowcharts, mindmaps, architecture diagrams, and 16 types of visualizations.

Desktop App MCP Powerful

CLI Web MCP Developer

Loginless Web MCP Easiest

Built into the MockFlow Desktop App. AI creates visuals directly on your open canvas — no URLs, no waiting.

1

Open Desktop App → open a MockFlow project

2

In Claude Code / Cursor, run:
claude mcp add --transport http -s user mockflow-ideaboard http://localhost:21193/mcp

3

Ask: "Create a flowchart for..."

Best for: Designers, product teams, daily MockFlow users.

Download Desktop App →

Install from npm, log in via browser (OAuth), and boards are saved to your MockFlow account.

1

npm install -g @mockflow/ideaboard-mcp

2

mockflow-ideaboard-mcp login

3

mockflow-ideaboard-mcp

Best for: Developers using Claude Code, Cursor, or VS Code Copilot.

npm Package →

Add MockFlow as a connector in Claude.ai or ChatGPT. No installation, no account required. A new board is created and you get a shareable URL.

1

Open Claude.ai → Settings → Connectors

2

Paste this URL: https://app.mockflow.com/ideaboard/mcp

3

Ask Claude to create a flowchart — done!

Best for: Managers, marketers, anyone using Claude.ai or ChatGPT in the browser.

Learn more about MockFlow MCP → Agent Skills for MCP

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