Quaderno
Customers ask about invoices, tax rates, and billing details. Your AI agent pulls real-time data from Quaderno, calculates applicable taxes for any jurisdiction, and delivers credit notes or invoice copies without your finance team lifting a finger. Global tax compliance on autopilot.
Your AI agent taps into Quaderno's tax engine and invoicing system, turning complex billing inquiries into instant, accurate answers across 12,000+ tax jurisdictions worldwide.
Quaderno
From international tax calculations to invoice delivery, watch how AI handles the billing questions that usually require your finance team's attention.
A customer in Germany asks what tax applies to their SaaS subscription. Your AI Agent sends their country code and product type to Quaderno's tax calculation API, which returns the current 19% VAT rate for digital services. The agent explains the tax breakdown clearly. The customer proceeds to purchase with confidence, and your team avoids another tax research ticket.
A customer messages asking for an invoice for their recent payment. Your AI Agent looks up their contact record in Quaderno, creates an invoice with the correct line items and tax treatment, and triggers email delivery through Quaderno's deliver invoice endpoint. The customer receives a tax-compliant invoice in their inbox within minutes, no human intervention required.
An EU business customer provides their VAT ID and asks to be invoiced without VAT. Your AI Agent validates the tax ID through Quaderno's validation endpoint against the VIES database. If valid, the agent confirms reverse-charge eligibility and updates the contact record. The next invoice is generated correctly. Your finance team never has to manually check a VAT number again.
Quaderno
FAQs
The agent sends the customer's country code, postal code, and product type to Quaderno's tax calculation API. Quaderno checks its database of 12,000+ tax jurisdictions and returns the applicable VAT, GST, or sales tax rate, including any reduced rates for specific product categories. The calculation happens in real time during the conversation.
Yes. Quaderno handles tax compliance for invoices globally. When the agent creates an invoice, Quaderno applies the correct tax rules, formatting requirements, and numbering sequences for the customer's jurisdiction. This includes EU VAT invoices, US sales tax documents, and formats required by other regions.
Tars requires your Quaderno API key (found under Developers > API Keys > Private Key) and your account subdomain. The API key provides access to tax calculations, contacts, invoices, and products. You control the scope by managing permissions in your Quaderno dashboard.
Yes. When a customer provides a VAT ID, the agent passes it to Quaderno's tax ID validation endpoint, which checks against the EU VIES database and other country-specific registries. The response confirms whether the number is valid, active, and registered to the correct entity.
No. Tars queries Quaderno in real time during conversations. Invoice details, contact records, and tax calculations are fetched live from your Quaderno account and used only to respond to the current conversation. Tars does not maintain a separate copy of your financial data.
Yes. Quaderno supports both one-off and recurring invoice types. The agent can create invoices for single purchases with correct tax treatment, or reference existing subscription billing. Product records in Quaderno store whether items are one-off or subscription-based, and the agent respects these settings.
The agent can access your complete Quaderno invoice history. Whether an invoice was created last week or two years ago, the agent retrieves it by ID or by searching the contact's records. Historical invoices are fully accessible from the moment you connect Quaderno.
Quaderno's checkout handles payment collection, while Tars adds a conversational AI layer on top. Your agent can answer tax questions, look up invoice details, validate VAT IDs, and deliver documents, all within a chat conversation on your website or WhatsApp. Customers get answers without navigating a billing portal.
Don't limit your AI Agent to basic conversations. Watch how to configure and add powerful tools making your agent smarter and more functional.
Privacy & Security
At Tars, we take privacy and security very seriously. We are compliant with GDPR, ISO, SOC 2, and HIPAA.
Email - sales@hellotars.com
.png)
%201.png)
%201.png)
