InvoiceXpress (Online Invoicing) MCP Server for LangChain 16 tools — connect in under 2 minutes
LangChain is the leading Python framework for composable LLM applications. Connect InvoiceXpress (Online Invoicing) through Vinkius and LangChain agents can call every tool natively. combine them with retrievers, memory, and output parsers for sophisticated AI pipelines.
ASK AI ABOUT THIS MCP SERVER
Vinkius supports streamable HTTP and SSE.
import asyncio
from langchain_mcp_adapters.client import MultiServerMCPClient
from langchain_openai import ChatOpenAI
from langgraph.prebuilt import create_react_agent
async def main():
# Your Vinkius token. get it at cloud.vinkius.com
async with MultiServerMCPClient({
"invoicexpress-online-invoicing": {
"transport": "streamable_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,
)
response = await agent.ainvoke({
"messages": [{
"role": "user",
"content": "Using InvoiceXpress (Online Invoicing), show me what tools are available.",
}]
})
print(response["messages"][-1].content)
asyncio.run(main())
* Every MCP server runs on Vinkius-managed infrastructure inside AWS - a purpose-built runtime with per-request V8 isolates, Ed25519 signed audit chains, and sub-40ms cold starts optimized for native MCP execution. See our infrastructure
About InvoiceXpress (Online Invoicing) MCP Server
Connect your InvoiceXpress account to any AI agent and take full control of your certified invoicing and client management in Portugal through natural conversation.
LangChain's ecosystem of 500+ components combines seamlessly with InvoiceXpress (Online Invoicing) through native MCP adapters. Connect 16 tools via Vinkius and use ReAct agents, Plan-and-Execute strategies, or custom agent architectures. with LangSmith tracing giving full visibility into every tool call, latency, and token cost.
What you can do
- Client Management — List all registered clients and retrieve detailed fiscal data including NIF/NIPC identifiers, addresses, and contact histories directly from your agent
- Invoice Lifecycle — Browse issued invoices and receipts, and access detailed line items and tax breakdowns for each document securely
- Estimate & Quotes — List and retrieve estimates and pro-forma invoices to monitor your sales pipeline and pending business proposals
- Item Inventory — Manage your catalog of faturable articles and services, including unit prices and associated VAT rates (IVA)
- Fiscal Compliance — Audit tax rates and exemptions active in your account to ensure mapping with official AT (Autoridade Tributária) tables
- Digital Delivery — Access permalinks to signed PDF documents for easy sharing and visual verification of fiscal items
The InvoiceXpress (Online Invoicing) MCP Server exposes 16 tools through the Vinkius. Connect it to LangChain in under two minutes — no API keys to rotate, no infrastructure to provision, no vendor lock-in. Your configuration, your data, your control.
How to Connect InvoiceXpress (Online Invoicing) to LangChain via MCP
Follow these steps to integrate the InvoiceXpress (Online Invoicing) MCP Server with LangChain.
Install dependencies
Run pip install langchain langchain-mcp-adapters langgraph langchain-openai
Replace the token
Replace [YOUR_TOKEN_HERE] with your Vinkius token
Run the agent
Save the code and run python agent.py
Explore tools
The agent discovers 16 tools from InvoiceXpress (Online Invoicing) via MCP
Why Use LangChain with the InvoiceXpress (Online Invoicing) MCP Server
LangChain provides unique advantages when paired with InvoiceXpress (Online Invoicing) through the Model Context Protocol.
The largest ecosystem of integrations, chains, and agents. combine InvoiceXpress (Online Invoicing) MCP tools with 500+ LangChain components
Agent architecture supports ReAct, Plan-and-Execute, and custom strategies with full MCP tool access at every step
LangSmith tracing gives you complete visibility into tool calls, latencies, and token usage for production debugging
Memory and conversation persistence let agents maintain context across InvoiceXpress (Online Invoicing) queries for multi-turn workflows
InvoiceXpress (Online Invoicing) + LangChain Use Cases
Practical scenarios where LangChain combined with the InvoiceXpress (Online Invoicing) MCP Server delivers measurable value.
RAG with live data: combine InvoiceXpress (Online Invoicing) tool results with vector store retrievals for answers grounded in both real-time and historical data
Autonomous research agents: LangChain agents query InvoiceXpress (Online Invoicing), synthesize findings, and generate comprehensive research reports
Multi-tool orchestration: chain InvoiceXpress (Online Invoicing) tools with web scrapers, databases, and calculators in a single agent run
Production monitoring: use LangSmith to trace every InvoiceXpress (Online Invoicing) tool call, measure latency, and optimize your agent's performance
InvoiceXpress (Online Invoicing) MCP Tools for LangChain (16)
These 16 tools become available when you connect InvoiceXpress (Online Invoicing) to LangChain via MCP:
create_client
Se não for fornecido um NIF, usa o valor Consumer (ou similar requerido pelo portal). Registar um novo cliente no InvoiceXpress com dados fiscais completos
create_item
Precisas sempre de um ID de taxa legal (consulta a ferramenta list_taxes previamente). Criar um novo artigo ou serviço para ser faturado
find_client
Pesquisar um cliente pelo nome empresarial
get_client
Obter detalhes completos de um cliente pelo seu ID
get_invoice
Obter todos os detalhes e o link PDF de uma fatura
get_item
Obter detalhes de um artigo ou serviço pelo seu ID
list_clients
Listar todos os clientes registados no InvoiceXpress
list_credit_notes
Listar todas as notas de crédito (devolução / acerto)
list_estimates
Listar todos os orçamentos emitidos de forma paginada
list_guides
Listar guias de transporte
list_invoices
Listar todas as faturas emitidas
list_items
Listar todos os artigos e serviços configurados no InvoiceXpress
list_receipts
Listar todos os recibos de pagamento de clientes
list_sequences
Listar as séries de faturas ativas, ex: FT 2026/
list_taxes
Listar as taxas de IVA e isenções ativas na conta
update_client
Só os parâmetros enviados serão substituídos, os restantes mantêm-se inalterados. Atualizar os dados demográficos de um cliente existente
Example Prompts for InvoiceXpress (Online Invoicing) in LangChain
Ready-to-use prompts you can give your LangChain agent to start working with InvoiceXpress (Online Invoicing) immediately.
"List the last 5 invoices from InvoiceXpress"
"Search for a client named 'TechPorto'"
"What are the active VAT rates in my account?"
Troubleshooting InvoiceXpress (Online Invoicing) MCP Server with LangChain
Common issues when connecting InvoiceXpress (Online Invoicing) to LangChain through the Vinkius, and how to resolve them.
MultiServerMCPClient not found
pip install langchain-mcp-adaptersInvoiceXpress (Online Invoicing) + LangChain FAQ
Common questions about integrating InvoiceXpress (Online Invoicing) MCP Server with LangChain.
How does LangChain connect to MCP servers?
langchain-mcp-adapters to create an MCP client. LangChain discovers all tools and wraps them as native LangChain tools compatible with any agent type.Which LangChain agent types work with MCP?
Can I trace MCP tool calls in LangSmith?
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Connect InvoiceXpress (Online Invoicing) to LangChain
Get your token, paste the configuration, and start using 16 tools in under 2 minutes. No API key management needed.