How to Use the InvoiceXpress (Online Invoicing) MCP in OpenAI Agents SDK

Build production OpenAI Agents SDK systems that issue compliant Portuguese invoices and track payments via this MCP Server.

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Connect InvoiceXpress (Online Invoicing) MCP to OpenAI Agents SDK

Create your Vinkius account to connect InvoiceXpress (Online Invoicing) to OpenAI Agents SDK 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 InvoiceXpress (Online Invoicing) with OpenAI Agents SDK

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Automated Tax-Compliant Client Onboarding

Using `create_client`, your OpenAI agents can register Portuguese clients directly. When a user submits billing details, the agent writes the data straight to your invoicing account. If they skip the tax ID, the system automatically falls back to the consumer default required by local tax rules. You do not need to build complex validation pipelines. The agent runs `find_client` to check for duplicates before creating a record, or updates existing profiles using `update_client` so your finance data stays clean.

Guardrailed Invoicing via OpenAI Agents SDK

By calling `list_taxes`, your agent can verify tax rates before writing invoices. This prevents your agent from guessing VAT codes during generation. It pulls active Portuguese rates, then uses `create_item` to set up services with the correct legal tax ID. Built-in guardrails ensure your agent never triggers a tax audit by mistake. By feeding the exact tax IDs into your runtime, you guarantee every invoice aligns with Portuguese tax authority standards.

Self-Service Document Retrieval

With `get_invoice`, your specialized agents can pull invoices and receipts for customers on demand. The agent fetches the direct PDF download link or checks `list_receipts` to verify payment status. This MCP Server exposes these actions directly to your agent system. Your agents handle the search, grab the files, and hand them to the user without manual developer intervention.

Setup guide

Set up InvoiceXpress (Online Invoicing) MCP in OpenAI Agents SDK

Prerequisites

Python 3.10+ installed
openai-agents package (pip install openai-agents)
Active Vinkius subscription with a valid endpoint token

1

Install the SDK

Run pip install openai-agents to install the OpenAI Agents SDK. The MCP integration is built-in — no extra dependencies needed.
2

Connect via SSE transport

Use MCPServerSse with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. The SDK auto-discovers all InvoiceXpress (Online Invoicing) tools at runtime.
3

Create your Agent

Pass the MCP to Agent(mcp_servers=[server]). The agent receives InvoiceXpress (Online Invoicing) tools as native definitions — JSON schemas resolve automatically.
4

Run the agent

Call Runner.run(agent, prompt) to execute. The agent invokes the appropriate InvoiceXpress (Online Invoicing) tools and returns structured results. Copy the full example on the right to get started.

agent.py

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerSse

async def main():
    async with MCPServerSse(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as server:
        agent = Agent(
            name="InvoiceXpress (Online Invoicing) Agent",
            instructions="You have access to InvoiceXpress (Online Invoicing) tools.",
            mcp_servers=[server],
        )
        result = await Runner.run(agent, "List recent transactions")
        print(result.final_output)

asyncio.run(main())

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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 InvoiceXpress. 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 InvoiceXpress (Online Invoicing) MCP in OpenAI Agents SDK

You run the server on Vinkius and grab your endpoint token. In your Python code, initialize MCPServerStreamableHttp with your unique URL and pass it to your Agent constructor. The SDK handles the rest behind the scenes.

Yes, you configure this in your agent definition. While the MCP Server exposes all 16 tools, you can instruct your agent to only call list_invoices or get_invoice if you want to restrict it to read-only actions.

The run will fail because Portuguese tax rules require a legal tax ID. To prevent this, configure your OpenAI Agents SDK agent to always call list_taxes first to pull the correct ID before running create_item.

You can set up a specialized billing agent that owns the InvoiceXpress tools. When a general support agent detects a billing request, it hands off the conversation to the billing agent, which uses list_estimates or get_invoice to solve the user's issue.

Vinkius runs the server in an isolated sandbox. Your customer names, NIF tax numbers, and invoice values never touch third-party servers; they go directly from your agent to the InvoiceXpress API over encrypted HTTPS.

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