NEWS: Voluntary registration via the Financial Administration of the Slovak Republic is now open.
Digital Postman
Flowis
- Certified delivery channel for e-Invoices via Peppol
- Receiving, sending, and integrating e-invoices
- Ready for mandatory e-Invoicing from 2027
Solutions for Businesses of All Sizes
from PDF to BIS 3
For companies whose system cannot create the mandatory e-invoice format.
Peppol Box
Designed for sole proprietors and small businesses that only need to receive e-invoices. The service is FREE.
No integration
No API, technical linking, or modifications to the existing system.
API integration
Integration for larger organizations, IT companies, and software providers.
Slovensko.Digital
Integration designed for software houses.
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Invoices in emails, on paper, and in folders? See how Flowis can make it easier for companies and sole proprietors to prepare for e-invoicing.
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Which group do you belong to?
For companies and individuals, for senders and recipients.
Company with its own accountant
You have issued and received e-invoices clearly in one place. However, if you use another provider for issued invoices, Flowis can only be integrated for received e-invoices.
Company with an external accountant
Even if you handle sending through another digital postal service, you can use Flowis only for received invoices and link it to your accounting system.
Sole trader
A simple solution without complex settings – you can only receive e-invoices, even if you don’t issue them.
Accounting firm
Manage multiple clients from one account.
Other professions
Also suitable for freelancers or schools – you can only receive e-invoices, or send them too, as needed.
Non-VAT payer
You need a digital postal service even if you only receive e-invoices and don’t issue anything.
Non-profit organization
You also need a digital postal service if you are a non-profit organization.
IT company / software provider
Flowis allows you to easily extend your software with e-invoicing without complex development.
Do You Want To Be Ready For E-invoicing?
Access Point Flowis helps you send, receive, validate, and track structured e‑invoices securely.
Features built
on real needs
Conversion of invoices to the mandatory BIS 3 format
You don’t have to change your accounting system. Simply upload the invoice to Flowis, and it will automatically convert it to the structured mandatory format.
Track invoices and their statuses in one place
In a simple and clear application, you can track issued and received e-invoices, their current status, and processing history.
Integration without interference
with the ERP system
Flowis Digital Postman integrates with your accounting system, and invoices are transferred automatically.
How does it work?
The entire system operates on the decentralized Peppol network, managed by the European Commission. Certified Digital Postal Services join the network to ensure the secure transfer of e-invoices from sender to recipient. Simultaneously, they send mandatory data to the Financial Administration of the Slovak Republic. Everything happens fully automatically.
“The transition to e-invoicing went smoothly, and the solution is fully compliant with the requirements of the Croatian Financial Administration. The Flowis team is a proactive, flexible, and reliable partner.
Iva Ćurić
Head of Accounting @ BIPA
We are certified Peppol Acces Point for small and large companies using various ERP systems.
Receive, send, and integrate e-invoices with your ERP system via Peppol.
A Digital Postal Service can do more
Delegating access
The accountant can work directly in the system; you just approve or check the result.
Quick setup without complications
Flowis is designed so you can handle e-invoicing quickly, even without technical knowledge.
Data for the Financial Administration
Flowis Digital Postman ensures that all necessary data is sent.
Security is comes first
Flowis Digital Postman meets the requirements for secure processing of sensitive data in the EU. Security is the foundation of the entire solution.
Do I need a Peppol Access Point?
Find out in 60 seconds.
Frequently Asked Questions
What is an e-invoice, and how does it differ from a PDF?
An electronic invoice is a structured document in XML format compliant with the European standard EN 16931 (UBL 2.1) and sent in accordance with the BIS 3 standard (a set of rules and security measures). A standard PDF sent via email is not an electronic invoice because, in addition to standards and a uniform format, it contains data that must be manually transcribed for further processing.
How will electronic invoices be sent to customers?
Through so-called “Peppol Access Points” (Service Providers, or DP for short), who ensure secure transmission over the international Peppol network
Who is required to have a Peppol Access Point starting January 1, 2027 in Slovakia?
Anyone who issues a domestic invoice and is a VAT payer must have a digital mail provider to send electronic invoices, and every domestic business must have a digital mail provider to receive invoices (unless you are absolutely certain that you will not receive an invoice from any VAT payer.)
Does e-invoicing also apply to end users (consumers)?
No. Mandatory e-invoicing applies only to invoicing between businesses (B2B) and between businesses and the government (B2G). It does not apply to end consumers (B2C).
Can I have more than one service provider?
For sending electronic invoices, yes, even more than that. But for receiving invoices, only one
Can I use Flowis for received e-invoices and a different email client for sent ones?
Yes. You can use Flowis for incoming invoices, even if you process outgoing invoices through a different email provider.
Who is Access Point Flowis best suited for?
Flowis is suitable for sole proprietors, small and large businesses, accounting firms, and the public and nonprofit sectors. Companies and invoicing and accounting systems can integrate it via API.
What else does Flowis offer besides receiving and sending e-invoices?
Flowis offers conversion of invoices to the BIS 3 format, an overview of their status and history, and access for accountants. By integrating with the Flowis system, you can automate the entire process for incoming invoices—from receipt through approval to posting in the accounting system.
Are there any exceptions where e-invoices cannot be used?
Yes, for example, classified contracts or deliveries to security agencies, where paper invoices or other methods are used
Will the control and summary report be eliminated?
Yes, but not until July 1, 2030. The data will be reported automatically through the e-invoice system.
How can an e-invoice be canceled after it has been sent?
Indirectly—errors are resolved through credit memos, corrections, and resending the corrected document
What types of documents will the e-invoice system support?
Invoices, self-billing invoices, and credit memos
Can I use older formats, such as EDIFACT?
Yes, but for VAT purposes after January 1, 2027, they must be converted into XML e-invoices in accordance with the EN 16931 standard.
Do you have any more questions?
We’d be happy to help you in choosing the best solution. Just sign up and ask our experts.
Are you interested in a Peppol Access Point?
- Automatic sending and receiving of e-invoices
- Secure encryption and archiving of documents
- Processing of PDF and other data formats into BIS 3
Various packages for companies and individuals.
We’ll get back to you with more information. If you have a specific question, you can ask it in the forum.