Last updated: February 19, 2026

1. Definitions

"VIESAC" (or "we", "us", "our") refers to the VIESAC service and its operator. "Service" means the VIESAC platform: EU VAT number validation via VIES, audit trail storage, PDF and XML certificates, REST API, extensions (e.g. WooCommerce), and related features. "User" (or "you", "your") means any person or entity accessing or using the Service. "VIES" is the EU's VAT Information Exchange System used to validate VAT numbers.

2. Agreement and Acceptance

By registering, accessing, or using VIESAC, you agree to these Terms of Service ("Terms"). If you are acting on behalf of an organization, you represent that you have the authority to bind that organization. If you do not agree, do not use the Service.

3. Eligibility

You must have authority to bind your organization (if acting on its behalf) and use the Service in compliance with applicable law.

4. Description of Service

VIESAC provides:

EU VAT number validation via the official VIES database
Audit trail storage with certificates and validation history (10+ years retention)
PDF certificates and technical XML certificates for compliance
REST API for integration into your systems
Extensions and plugins for e-commerce and accounting software

The Service is designed to support compliance with EU VAT rules, including ViDA (VAT in the Digital Age), and general EU legislation. We do not provide tax, legal, or accounting advice; you are responsible for your own compliance.

5. Account Registration and Security

You must provide accurate account information and keep it up to date. You are responsible for maintaining the confidentiality of your credentials and for all activity under your account. Notify us immediately at support@viesac.eu of any unauthorized use.

6. Usage Limits and Plans

Usage is governed by your selected plan. Plans have monthly validation limits. Exceeding limits may result in blocked validation until the next billing period or plan upgrade. Plan terms and pricing are as displayed at the time of purchase; we may change pricing with reasonable notice to existing subscribers.

7. Acceptable Use

You agree to use the Service only for lawful purposes and in compliance with these Terms. You must not:

Use the Service for fraud, money laundering, or any illegal activity
Circumvent usage limits, security measures, or access controls
Attempt to reverse engineer, decompile, or extract source code
Resell, sublicense, or provide the Service to third parties except as permitted by your plan
Use the Service in a way that harms VIESAC, other users, or third parties
Transmit malware, spam, or unauthorized automated requests

We may suspend or terminate accounts that violate these rules.

8. Data Ownership, Processing, and Privacy

You retain ownership of your data. We process data in accordance with our Privacy Policy and the EU General Data Protection Regulation (GDPR). Our servers are located in the EU (Germany, Nuremberg); we do not transfer personal data outside the EU except with appropriate safeguards.

You are the data controller for validation data you submit (e.g. VAT numbers, order references); we act as processor. You must ensure your use of the Service complies with GDPR and local data protection laws. For data subject requests and privacy inquiries, contact legal@viesac.eu.

9. Intellectual Property

VIESAC, its name, logo, and all related materials are our intellectual property or our licensors'. You receive no ownership rights. You may not use our trademarks or branding without prior written consent. We do not claim ownership of your content; by using the Service you grant us the limited rights needed to operate it (e.g. storing, processing, and displaying your audit data).

10. Subscription, Billing, and Refunds

Subscriptions are billed in advance (monthly or annually). Payment is processed via Stripe; by subscribing you agree to Stripe's terms. You may cancel at any time; cancellation takes effect at the end of the current billing period. Refund policy is as stated at the time of purchase; we do not generally refund for partial periods. We may change pricing with at least 30 days' notice; continued use after the effective date constitutes acceptance.

11. Service Availability

The Service depends on the EU VIES system and other third parties. We do not guarantee uninterrupted availability of VIES or our Service. When VIES is unavailable, we may use fallback methods or schedule retries; validation results are not guaranteed in such cases. We strive to maintain high availability but exclude liability for third-party or force majeure outages.

12. Limitation of Liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, VIESAC SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING LOST PROFITS, DATA LOSS, OR BUSINESS INTERRUPTION, ARISING FROM OR RELATED TO THE SERVICE. OUR TOTAL AGGREGATE LIABILITY SHALL NOT EXCEED THE FEES YOU PAID TO US IN THE 12 MONTHS PRECEDING THE CLAIM. Some jurisdictions do not allow these exclusions; in such cases our liability is limited to the maximum extent permitted by law. We do not guarantee that validation results are suitable for your specific tax or legal obligations.

13. Indemnification

You agree to indemnify and hold VIESAC harmless from any claims, damages, losses, or expenses (including reasonable attorneys' fees) arising from: (a) your use of the Service, (b) your violation of these Terms or applicable law, (c) your data or content, or (d) any third-party claim related to your use of the Service.

14. Termination

We may suspend or terminate your account for breach of these Terms, non-payment, or at our discretion with notice. You may terminate your account at any time via the Service or by contacting us. Upon termination, your right to use the Service ceases immediately. Data retention after termination is governed by our Privacy Policy; you may request data export before termination. Provisions that by their nature should survive (e.g. liability, indemnification) will survive termination.

15. Modifications

We may modify the Service or these Terms from time to time. Material changes to the Terms will be notified via email or prominent notice in the Service, with at least 30 days before the effective date. Continued use after the effective date constitutes acceptance. If you do not agree, you must stop using the Service before the effective date and may terminate your account.

16. Governing Law and Dispute Resolution

These Terms are governed by the laws of the European Union and, where applicable, the laws of Estonia, without regard to conflict of law principles. Disputes shall first be addressed through good-faith negotiation; failing that, they may be submitted to the courts of competent jurisdiction in the EU.

17. General

These Terms constitute the entire agreement between you and VIESAC regarding the Service. No waiver of any term is effective unless in writing. If any provision is held invalid, the remaining provisions remain in force. We may assign these Terms; you may not assign without our written consent. Notices to you may be sent by email to your registered address.

18. Operator and Contact

Operator: Comet Group OÜ (registry code 12568148), Ida-Viru maakond, Narva linn, P. Kerese tn 5, 20309, Estonia. VAT: EE101678030. e-Business Register.

For legal inquiries, complaints, or notices under these Terms, contact us at legal@viesac.eu.