Lemon Squeezy Server Interface

An implementation of the Model Context Protocol (MCP) server designed to interface seamlessly with the Lemon Squeezy digital sales infrastructure. This module manages critical business functions, including ongoing customer subscriptions, payment gateways, inventory items, and transactional record-keeping. The server establishes a well-defined conduit for remote, scripted administration of your Lemon Squeezy merchandising presence, incorporating detailed operational logging and direct, tool-based command execution capabilities.

Demonstration

Prerequisites

• Operating environment requires Python version 3.8 or newer.
• MCP SDK baseline of 0.1.0 or higher.
• Dependency: aiohttp library.
• Dependency: python-dotenv for environment variable management.

Operational Modules

Data Access Points (Resources)

This server exposes an MCP-compliant data structure dedicated to logging procedural actions taken via the provided tools:

• Archives records of every Lemon Squeezy operation initiated through the provided tooling.
• Makes the complete audit trail accessible via the read_resource interface.
• Essential for troubleshooting workflows and maintaining regulatory compliance trace.

Control Mechanisms (Tools)

A comprehensive set of operations mirroring Lemon Squeezy functionalities, accessible via MCP tool calls:

🛍️ Storefront and Merchandise Tools

• get_user: Retrieves authentication subject details.
• list_stores: Enumerates all associated digital storefronts.
• get_store: Fetches specific storefront configuration data.
• list_products: Retrieves a roster of available catalog items.
• get_product: Fetches detailed specifications for an individual item.
• get_product_variants: Lists all purchasable options for a specific product.

🧾 Transaction and Client Tools

• list_orders: Retrieves a history of all processed customer transactions.
• get_order: Fetches granular data for a specified transaction.
• list_customers: Retrieves a registry of all registered clientele.
• get_customer: Fetches detailed profiles for a specific client record.

🔑 Recurring Billing and Licensing Tools

• list_subscriptions: Retrieves records of recurring billing arrangements.
• get_subscription: Fetches details for an individual recurring payment plan.
• list_license_keys: Retrieves issued software authorization codes.
• get_license_key: Fetches specific information concerning an authorization code.

🌐 Commerce Endpoint and Notification Tools

• create_checkout: Generates a dynamically configured digital purchase session.
• create_webhook: Registers a new system notification endpoint.
• list_webhooks: Retrieves the list of registered notification endpoints (supports filtering by storefront).

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Core Capabilities

• Management of Recurring Payments and Purchase Sessions
• Configuration and Inventory of System Notifications
• Immutable Logging for All Executed Actions
• Adherence to MCP Standards for Tooling and Data Structures
• Robust Feedback Mechanisms for Errors and Logging

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Deployment Instructions

Automated Setup via Smithery

To install the LemonSqueezy Interface for use with Claude Desktop automatically through Smithery:

npx -y @smithery/cli install @atharvagupta2003/mcp-lemonsqueezy --client claude

Local Dependency Installation

python -m venv venv
source venv/bin/activate  # For Unix-like systems
venv\Scripts\activate    # For Windows systems
pip install -e .

Configuration Variables

Define necessary secrets in a .env configuration file:

LEMON_SQUEEZY_API_KEY=your_lemonsqueezy_api_key

Integration with Claude Desktop

Modify your Claude Desktop configuration file (path location provided below) to incorporate this server definition:

Windows Location: C:\Users\\AppData\Roaming\Claude\claude_desktop_config.json

MacOS Location: ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "lemonsqueezy": {
      "command": "/Users/hp/.local/bin/uv",
      "description": "Control interface for the lemonsqueezy financial transaction platform",
      "args": [
        "--directory",
        "/ABSOLUTE/PATH/TO/PARENT/FOLDER/src/mcp_lemonsqueezy",
        "run",
        "--with",
        "fastmcp",
        "server.py"
      ],
      "env": {
         "LEMONSQUEEZY_API_KEY": "<YOUR-API-KEY>"
       }
    }
  }
}

Operational Use

Initiating the Server Process

uv run src/mcp_lemonsqueezy/server.py

Illustrative MCP Invocation Schemas

Fetching User Context

{
  "tool": "get_user",
  "arguments": {}
}

Retrieving All Storefronts

{
  "tool": "list_stores",
  "arguments": {}
}

Querying Store Details by Identifier

{
  "tool": "get_store",
  "arguments": {
    "store_id": "164870"
  }
}

Exception Management

The server relays descriptive diagnostic messages for predictable failure states: - HTTP 401 (Unauthorized): Indicates a failure due to missing or invalidated API credential. - HTTP 422 (Unprocessable Entity): Occurs when provided parameters, such as customer or merchandise identifiers, are invalid or absent. - HTTP 400 (Bad Request): Signifies structural errors within the transmitted JSON payload.

Development Lifecycle

Validation and Debugging

Execute the MCP Inspector utility for interactive command testing:

npx @modelcontextprotocol/inspector uv run --with fastmcp /ABSOLUTE/PATH/TO/PARENT/FOLDER/src/mcp_lemonsqueezy/server.py

Package Assembly

1. Update current dependencies:

uv compile pyproject.toml

1. Build the distribution artifact:

uv build

Community Contributions

We welcome input from the community! Consult our Contributing Guidelines for submission protocols.

Licensing

This software is distributed under the terms of the MIT License. See the LICENSE file for full details.

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