How to Use the UnionPay Open Platform MCP in LangChain

Q: How do I use UnionPay Open Platform with LangChain to manage card tokens?

Your agent first calls requestcardtoken to secure the card data. If you need to revoke that access later, you simply call cancelcardtoken. This process keeps your payment flow compliant and manageable within a single chain.

Q: Can LangChain use UnionPay Open Platform to check transaction status?

Yes. You can generate a QR code with generateqrcode, and then the agent uses getqrtransactionstatus to confirm if the payment went through. This two-step process ensures you get the definitive, real-time outcome.

Q: What is the best way to handle risk checks with UnionPay Open Platform and LangChain?

Before processing a transaction, always run checkcardriskstatus. This allows your agent to make an informed decision on whether to proceed. It's a key part of building reliable payment logic.

Build complex payment flows and secure transactions using LangChain.

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Connect UnionPay Open Platform MCP to LangChain

Create your Vinkius account to connect UnionPay Open Platform 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 UnionPay Open Platform with LangChain

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Orchestrate full card lifecycle for LangChain

The `request_card_token` tool lets your agent tokenize a UnionPay card immediately. After getting the token, you can pass it to `verify_card_kyc`, which checks identity and binds the card in one step. You'll build multi-step pipelines that handle everything from initial payment setup using `init_secure_payment` to confirming the final status with `get_qr_transaction_status`. This structured approach lets you manage complex payments without hardcoding steps.

Manage UnionPay QR codes for LangChain

`generate_qr_code` creates a unique payment identifier that your agent can use. Once the code is generated, the flow continues by calling `get_qr_transaction_status`. This mechanism checks if the payment went through successfully. This pairing allows you to build reliable checkout systems. You'll execute the full sequence—from generating the QR code to checking its final status—all within a single reasoning chain.

Control card tokens with LangChain

Need to revoke access or cancel an old token? Use `cancel_card_token` to unbind an existing UnionPay card token. This is crucial for security protocols. If you suspect fraud, the agent can first run `check_card_risk_status` before allowing any subsequent actions. It's a critical step in making your payment flow safer.

Setup guide

Set up UnionPay Open Platform 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 UnionPay Open Platform 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({
    "unionpay-open-platform-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 UnionPay Open Platform transactions"
    })
    print(result["messages"][-1].content)

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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by UnionPay Open Platform. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Common questions about UnionPay Open Platform MCP in LangChain

Your agent first calls `request_card_token` to secure the card data. If you need to revoke that access later, you simply call `cancel_card_token`. This process keeps your payment flow compliant and manageable within a single chain.

Yes. You can generate a QR code with `generate_qr_code`, and then the agent uses `get_qr_transaction_status` to confirm if the payment went through. This two-step process ensures you get the definitive, real-time outcome.

This MCP Server handles several sensitive data points, including card tokens and transaction status. Specifically, `request_card_token` manages the secure storage of temporary card credentials.

Absolutely. You build a chain where one tool's output feeds directly into the next. For example, verifying identity via `verify_card_kyc` can precede initiating payment checkout using `init_secure_payment`.

Before processing a transaction, always run `check_card_risk_status`. This allows your agent to make an informed decision on whether to proceed. It's a key part of building reliable payment logic.

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