How to Use the InvoiceXpress (Online Invoicing) MCP in Claude

Q: How does Claude Desktop handle VAT rates with the InvoiceXpress (Online Invoicing) MCP Server?

The MCP server uses listtaxes to fetch active Portuguese VAT codes directly from your account. Claude Desktop reads these codes to ensure you apply the correct legal tax rate to new items.

Q: What happens if I try to create an invoice for a customer who has no NIF?

The createclient tool automatically applies the fallback Consumer value required by the Portuguese tax authority. This keeps your billing workflow running without manual interventions.

Run your Portuguese billing directly from Claude Desktop to issue invoices, manage clients, and track payments instantly.

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Connect InvoiceXpress (Online Invoicing) MCP to Claude Desktop

Create your Vinkius account to connect InvoiceXpress (Online Invoicing) to Claude Desktop 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 Claude Desktop

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The `create_client` tool registers new customers with full tax data inside your InvoiceXpress account. If you do not provide a NIF (VAT number), this tool automatically uses the Consumer fallback required by Portuguese tax authorities. Your agent uses `find_client` and `update_client` to keep customer records accurate without leaving the chat. Claude Desktop reads your local database or CRM file, compares the records, and updates only the changed parameters.

Audit-ready billing with local tax compliance

The `list_taxes` tool provides active Portuguese VAT rates and exemptions directly to your Claude Desktop interface. You must run this tool to grab a valid tax ID before you can generate any billable items. Once you have the tax ID, the `create_item` tool configures a new product or service for billing. Claude Desktop links these tools to ensure every invoice complies with Portuguese AT regulations using the MCP Server.

Real-time tracking of finances and estimates

The `list_invoices` tool pulls your entire history of issued invoices directly into your Claude Desktop workspace. You can filter this list to check payment statuses or identify overdue accounts in seconds. Your agent combines `list_receipts` and `list_estimates` to monitor cash flow and pending proposals. You get immediate visibility into active billing cycles without logging into the Portuguese web portal.

Setup guide

Set up InvoiceXpress (Online Invoicing) MCP in Claude Web or Desktop

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.
2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL: https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.
3

Start a conversation

Open a new chat. The InvoiceXpress (Online Invoicing) MCP tools are available immediately — no restart needed.

Endpoint URL

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

No configuration file needed — paste the URL directly in the Claude web interface.

Available on Free (1 connector), Pro, Max, Team, and Enterprise plans.

Prerequisites

Claude Desktop installed (macOS or Windows)
Active Vinkius subscription with a valid endpoint token

1

Open Claude Desktop Settings

Click the menu icon at the top-left corner, go to Settings → Developer → Edit Config. This opens claude_desktop_config.json in your default text editor.
2

Paste the InvoiceXpress (Online Invoicing) MCP configuration

Copy the JSON snippet on the right into the mcpServers object. Replace [YOUR_TOKEN_HERE] with your endpoint token from cloud.vinkius.com.
3

Restart Claude Desktop

Close and reopen the application. Claude needs a full restart to load new MCPs — refreshing a conversation is not enough.
4

Verify the connection

Open a new conversation. Click the 🔌 icon at the bottom of the message input. You should see tools listed under invoicexpress-online-invoicing-mcp.

json

{
  "mcpServers": {
    "invoicexpress-online-invoicing-mcp": {
      "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    }
  }
}

Get your connection token →

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 Claude Desktop

You ask Claude Desktop to search for a customer name. The agent runs `find_client` to locate the business details and pulls the exact ID from your InvoiceXpress database.

Yes, you can view and coordinate payments. Claude Desktop uses `list_receipts` to verify customer payments and matches them against existing invoices.

The MCP server uses `list_taxes` to fetch active Portuguese VAT codes directly from your account. Claude Desktop reads these codes to ensure you apply the correct legal tax rate to new items.

The `create_client` tool automatically applies the fallback Consumer value required by the Portuguese tax authority. This keeps your billing workflow running without manual interventions.

All customer VAT numbers and invoice financial records stay within your local Claude Desktop sandbox. Vinkius processes these MCP calls via an encrypted V8 isolate, meaning no tax data is stored or exposed to external networks.

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