How to Use the Younium MCP in LangChain

Q: How does Younium help with subscription management in LangChain?

You use the createsubscription tool to build a workflow that provisions new billing access. Your agent can chain this call into other steps, like sending confirmation emails or updating internal CRM records.

Q: Can I retrieve historical financial data from Younium using LangChain?

Yes. The getsubscription tool retrieves details for a specific subscription, including all its historical versions. This lets your agent build deep analytical chains based on past billing performance.

Q: Does the MCP Server support listing accounts with Younium and LangChain?

Absolutely. The listaccounts tool allows your client to fetch all customer records from the Younium ERP. This list provides the necessary identifiers needed for subsequent, targeted billing actions.

Q: How do I list current products in Younium using LangChain?

You call the listproducts tool. It pulls all available items from the Younium product catalog, giving you a complete list of what can be sold or tracked within your billing workflow.

Build complex billing pipelines with LangChain and Younium.

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Connect Younium MCP to LangChain

Create your Vinkius account to connect Younium to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup Younium with LangChain

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Track Billing Metrics in a Chain

The `get_metrics` tool retrieves key financial data like MRR, ARR, and TCV for any given subscription. You can chain this call directly into subsequent steps, letting your agent decide how to process these numbers. Your AI client uses the output of `get_metrics`—the specific metric values—to determine its next action. This makes building multi-step reasoning pipelines simple; you just link the tool calls together.

Manage Subscriptions and Accounts

Need to handle account changes? The `create_subscription` tool lets your agent provision new subscriptions for existing customers. You pass in the necessary JSON details, and the billing record gets created immediately. Similarly, if you need to terminate access, the `cancel_subscription` tool handles it by requiring specific subscription and version IDs plus an effective date. It's a direct, actionable step for account management.

Query Billing Records

Listing records is quick. Use `list_accounts` to get a full roster of every customer registered in Younium. This initial list provides the necessary identifiers needed for subsequent calls. Want invoices or products? The client makes it straightforward. Calling `list_invoices` fetches all generated billing documents, while `list_products` gives you the current catalog of items sold.

Setup guide

Set up Younium MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes Younium tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "younium-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent Younium transactions"
    })
    print(result["messages"][-1].content)

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Common questions about Younium MCP in LangChain

You use the `create_subscription` tool to build a workflow that provisions new billing access. Your agent can chain this call into other steps, like sending confirmation emails or updating internal CRM records.

Yes. The `get_subscription` tool retrieves details for a specific subscription, including all its historical versions. This lets your agent build deep analytical chains based on past billing performance.

Absolutely. The `list_accounts` tool allows your client to fetch all customer records from the Younium ERP. This list provides the necessary identifiers needed for subsequent, targeted billing actions.

This server handles account configuration and subscription details. Specifically, it processes account billing records when you use tools like `create_account` or `get_account`.

You call the `list_products` tool. It pulls all available items from the Younium product catalog, giving you a complete list of what can be sold or tracked within your billing workflow.

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