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Electronic invoicing is an obligation for all companies covered by the new legislation. At the same time, it is an opportunity that can help companies simplify processes, reduce administration and speed up the flow of documents. However, for digitalisation to deliver the expected results, it is not enough to choose a solution that can send an invoice. The Digital Postman becomes part of the company's finance and IT infrastructure – it handles sensitive data, connects ERP systems and must be available whenever the company needs it.

When choosing one, you should therefore look not only at price or the number of features, but above all at security, integration, level of automation, flexibility and guaranteed availability.

ERP integration: Minimal manual work

The real benefit of e-invoicing only comes when invoices no longer have to be transferred manually between systems. The Digital Postman must be able to integrate with your ERP or accounting system and automate the entire document flow.

So check whether it offers a solution suitable for your ERP system, which APIs or ready-made connectors are available and what the options are for automatic sending and receiving of invoices. Also find out how the system alerts you to an undelivered or faulty document and whether the invoice status can be tracked directly in the ERP.

The solution should adapt to the company, not the other way round

Every company has its own invoicing and approval processes. So when choosing, it is not enough to find out everything the solution “can do”. What matters more is how well it can adapt to your existing processes.

Ask whether user permissions, connection to existing approval workflows, notifications, integration rules and exception handling can be configured to suit your organisation's needs.

A flexible solution supports automation without the company having to fundamentally change its internal processes or create unnecessary manual steps.

SLA and support: What happens in case of an outage?

In financial processes, service availability is critical. What matters is not only how the service works during normal operation, but also what happens when a problem occurs.

Before signing the contract, ask for specific SLA parameters (service level agreement). The basic criteria include guaranteed availability, clearly defined response times for errors and escalation rules.

Also find out how the vendor handles planned maintenance, technical incidents and possible outages. What happens to an invoice the company issues while the service is unavailable? When will it be sent? How will the customer know it was delivered successfully?

Also clarify who provides updates to the solution when legislation or Peppol network rules change and whether they are included in the service price.

What to ask the vendor before signing the contract?

Before deciding, we recommend asking every vendor the same specific questions:

• Does your solution have a TLS A+ rating and does your company hold ISO 27001 certification?
• How does the solution integrate with our ERP and which APIs or connectors do you provide?
• Can we automate both sending and receiving invoices?
• To what extent can the solution be adapted to our internal processes?
• What availability do you guarantee in the SLA?
• What is the guaranteed response time for a critical error?
• Are updates for changes in legislation and Peppol network rules included in the service price?

The Digital Postman as a reliable part of company processes

When choosing a Digital Postman, the CFO and IT manager look beyond the price per invoice sent, focusing mainly on the benefits the solution brings to the company. What counts is which risks it eliminates, how much manual work it removes, and what availability and support the vendor guarantees.

The right Digital Postman is part of the company infrastructure that ensures e-invoice delivery and provides reliable support for both the finance and IT departments.

Discover e-invoicing options for your company at mibpeppol.sk/en.

In the next article you will read: mib:Peppol – e-invoicing for SAP and other ERP systems: Introducing the e-invoicing solution

In the article “How e-invoicing works in practice”, we described the journey of an invoice from issue to receipt. Now we take a closer look at the Digital Postman, which handles its transmission in the Peppol network.

The Digital Postman is a certified delivery service provider that connects a company to the Peppol network and delivers electronic invoices. For this purpose, it operates an access point to the network – in Peppol terminology, an Access Point.

The international framework of the network is governed by the OpenPeppol association; in Slovakia, the role of the Peppol Authority is performed by the Financial Directorate of the Slovak Republic.

What does the Digital Postman do?

The Digital Postman's task is to ensure that an electronic invoice travels securely from the sender all the way to the recipient. Ideally, the whole process runs automatically in the background for the user.

Its main tasks include:

• Registering companies in the Peppol network – registers the company and the data needed to deliver electronic invoices.
• Data transformation and validation – if transformation is needed, creates an XML file from the received data. It also checks whether the electronic document meets the technical requirements and the relevant Peppol standards.
• Finding the recipient – makes sure the document reaches the correct participant in the Peppol network.
• Sending electronic invoices – takes the invoice from the accounting or ERP system and delivers it via the Peppol network.
• Receiving electronic invoices – receives invoices and other documents from the Peppol network and passes them on to the recipient's system.
• Reporting to the Slovak Financial Administration – creates a file with information for the Slovak Financial Administration from the transmitted invoice, referred to as a TDD (Tax Data Document), and sends it to the Financial Administration's Access Point.
• Secure data transmission – ensures secure communication between the sender, the Peppol network and the recipient. Transmission between Access Points uses the AS4 protocol, which signs and encrypts messages.
• Connecting different systems – enables different accounting, ERP and invoicing systems to communicate with each other without the need for a direct connection between every pair of companies.
• MLS status messages (Message Level Status) – provide information on whether a document has been accepted or rejected.

MIBFORMA as a certified Digital Postman

MIBFORMA a.s. is a certified delivery service provider. It is listed by the Slovak Financial Administration under the identifier EFSK000004. Its Access Point is part of the mib:Peppol solution.

Book a consultation on connecting your ERP system to the Digital Postman.

In the next article you will read: How to choose a certified Digital Postman: A buyer's guide for CFOs and IT managers

The video is a short practical demonstration of how the mib:Peppol solution works in an SAP environment.

It shows the entire process, from issuing an invoice in SAP and sending it via mib:Cockpit, to receiving the invoice in a second SAP system.

The demo also covers transmission monitoring and visualisation of the received invoice in PDF format.

This demo is followed by the video “Incoming and Outgoing Transmissions – One Document from the Sender and Recipient Perspectives”, which shows the document transmission from the mib:Peppolbox perspective.

This video follows on from the “Demo of Sending and Receiving an Invoice in SAP” and shows the document transmission from the mib:Peppolbox perspective.

mib:Peppolbox displays not only individual invoices, but entire transmissions – that is, all documents and information exchanged within a given transmission.

The Sent Transmissions application lists transmissions in which your company is the sender. The Incoming Transmissions application lists transmissions in which your company is the recipient.

The detail view of each transmission provides its complete history – the document content, the other party's response, tax submissions, a log of the individual steps and other information related to the transmission.

Users are organised into company groups. One of the customer users has administrator rights and manages the other users in their group, including setting up the companies they can access. Users who work with multiple companies can switch between them directly in mib:Peppolbox.

The video shows a single transmission from the perspective of both the sender and the recipient, together with the information available for it in mib:Peppolbox.

Documents can also be sent directly using the Document Upload application in mib:Peppolbox. You can upload a single invoice or a whole batch of documents at once.

mib:Peppolbox checks the content of the uploaded documents and prevents duplicates. You can then send them to the Peppol network and track their delivery status directly in the application.

This option can be used, for example, when API integration is not available.

The video shows the entire procedure, from uploading documents to checking that they have been sent and delivered.

Access to the API and its documentation is granted after registration, which is approved by an administrator.

An API token is used for communication between an external system and mib:Peppolbox. The token is issued by your company's administrator directly in mib:Peppolbox, or by a MIBFORMA administrator. Once created, the token is displayed only once, so it must be stored securely.

The API token is used for authorisation on every call to the individual endpoints. Documents and data sent via the API are also available directly in mib:Peppolbox.

The video shows registration and login, the creation of an API token and the first API call via Swagger.

In the previous article, we explained the legislative obligations introduced from 1 January 2027 by the amendment to the VAT Act. However, many businesses still find it difficult to imagine how the entire exchange of documents will work in their day-to-day operations.

Are you wondering how an e-invoice is delivered step by step, what role the so-called Digital Postman plays, and what practical benefits it brings to your accounting processes? You will find the answers here.

How is an E-Invoice sent and delivered in 5 steps?

You can think of the e-invoicing process in much the same way as traditional mail: you write a letter, put it in an envelope, the postman collects it, checks the address and delivers it directly to the recipient’s mailbox. In the digital world, the process works in a similar way, but at lightning speed and with the highest level of security.

• Invoice Issuance: The sender (supplier) generates the invoice in their invoicing, accounting or ERP software in the same way as before. The software converts the document into the standardised XML / Peppol BIS 3.0 data format.
• Sending via the Digital Postman: The supplier’s system sends the e-invoice to its Digital Postman (Access Point).
• Secure Transmission via the Peppol Network: The supplier’s Digital Postman establishes an encrypted connection with the customer’s Digital Postman and securely transmits the document.
• Automatic Reporting to the Tax Authority: At the same time, the required data from the e-invoice is automatically transmitted in real time to the Slovak Financial Administration in the form of a TDD (Tax Data Document).
• Receipt by the Customer: The customer’s Digital Postman delivers the e-invoice directly to the customer’s accounting software, where it is automatically recorded without the need for manual data entry.

What benefits does the E-Invoicing revolution bring to businesses?

Although the new legislation may at first seem like yet another administrative obligation, it will bring significant practical benefits to businesses in their day-to-day operations:

• No more manual data entry: Invoice data is imported into the accounting system automatically, eliminating errors caused by manual data entry.
• 100% guaranteed delivery: Thanks to the Digital Postman and MLS (Message Level Status) confirmation messages, you receive immediate confirmation that the invoice has been delivered to the customer. No more excuses such as “the invoice ended up in spam”.
• Faster payment and approval: Immediate delivery shortens internal approval processes and helps accelerate invoice payment.
• Lower operating costs: You save on printing, paper, envelopes, postage and the physical storage of document binders.
• Fewer reporting obligations in the future: The continuous transmission of data to the Slovak Financial Administration will eventually replace complex VAT reporting requirements, such as the VAT Control Statement and the EC Sales List.

Would you like to prepare your company for the new era of invoicing smoothly and stress-free? Discover our certified mib:Peppol solution.

In the next article, you will learn: Who is the Digital Postman and what is its role in the Peppol network?

Paper invoices stored in binders and ordinary PDF files sent by email are gradually being phased out in Slovakia. From 1 January 2027, a new obligation will come into effect that will fundamentally change the way Slovak companies communicate, manage their accounting and fulfil their tax obligations. Mandatory electronic invoicing (e-invoicing) for the B2B and B2G sectors ushers in a new era of automation and security.

What obligations will apply to companies and businesses?

The legal framework for electronic invoicing is governed by Act No. 222/2004 Coll. on Value Added Tax, as amended. From 1 January 2027, the following clearly defined obligations will apply:

• Obligations for Senders (Suppliers): If you are a VAT payer and supply goods or services to another business (a domestic B2B transaction), you will be required to issue invoices exclusively in XML format and send them via an approved channel (the Peppol network). This obligation applies to standard and summary invoices, credit notes, debit notes, tax documents for advance payments received, and self-billing documents. Invoice data will also be transmitted to the Slovak Financial Administration in real time.
• Obligations for Recipients (Customers): Every company, business or self-employed person must be able to receive an electronic invoice in XML format – even if they do not issue e-invoices themselves or are not VAT payers, provided that they purchase goods or services from VAT payers.
• Archiving Obligation: The law requires invoices to be retained for 10 years, while ensuring the authenticity of their origin, the integrity of their content and their legibility throughout the entire retention period.

How can you prepare today?

January 2027 may seem a long way off, but adapting internal processes and software takes time. We recommend checking whether your accounting or ERP system is ready, confirming with your software provider how Peppol integration is planned, and selecting a certified Digital Postman well in advance.

Would you like to check whether your system is ready for E-Invoicing?

Download our free Digital Postman Readiness Checklist, available for SAP, non-SAP and SAP DRC solutions.

In the next article, you will learn: How electronic invoicing will work in practice – from issuing an invoice and sending it via the Digital Postman to its receipt.

Event details

Programme

1. A demonstration of a simulated e-Invoice processing run in both directions

   A step-by-step video demonstration of outgoing and incoming document processing in mib:Cockpit (directly inside SAP) and in the mib:Peppolbox monitoring portal (for SAP and non-SAP systems alike).

2. A summary of what we have learned so far from ongoing project preparations

   Real-world experience from project delivery, integration setup and the verification of partners' master data.

3. A special offer for implementation projects at companies that have not yet chosen a provider

Who is the webinar for?

The webinar is designed for chief financial officers (CFOs), IT managers, chief accountants, SAP specialists and company directors looking for a dependable technical solution for mandatory e-invoicing.

Expanding our website with information on the mib:Peppol solution

During May we added information about our mib:Peppol product to the website www.mibforma.sk. This product handles the sending and receiving of invoices within SAP systems as well as the connection of non-SAP systems to our Access Point certified for the Peppol network in Slovakia.

SAP DRC Workshop for e-Invoicing

On 28 May 2026, an SAP partner meeting took place at the premises of SAP Slovensko s.r.o. The topic was the SAP DRC platform for e-Invoicing. SAP Slovensko is actively working on the localisation of the solution, which is already in use in other countries in the Peppol network. In the coming days and weeks, various webinars for partners and customers will take place. We received from our colleagues an overview of the current state of the solution, the legislation and the outlook for changes and steps in the near future. The meeting featured an active, constructive discussion, with SAP answering consultants' questions. In the coming weeks we expect further guidance from SAP on how to approach the solution so that every customer is ready in time.

Launch of the test and production SMP

During May, the Financial Administration of the Slovak Republic made available the functionality of both the test and production environments of the central SMP server (Service Metadata Publisher). This server acts as a directory of Peppol network participants registered in Slovakia. The sending Access Point reads data from the SMP server to determine where to deliver a document and whether the receiving Access Point can process the given document type. The registration of a participant is carried out by a Service Provider (Digital Postman), selected by the applicant on the Financial Administration website. The chosen Digital Postman is automatically notified of the registration by the Financial Administration.

Partners

We are seeking to extend our own commercial and delivery capacities with the capacity of a partner network. As part of this, we have agreed on cooperation with long-standing SAP partner JUST IT Solutions s.r.o. We believe this step will deepen both professional expertise and the availability of the solution to further customers.

What do we expect in June?

In June we are preparing the launch of a website dedicated exclusively to electronic invoicing. You will find Mibforma a.s. solutions for SAP users as well as customers with other ERP and invoicing systems. Demonstrations of the software for managing invoice sending and receiving, as well as the monitoring tool for tracking communication, will also be available. You will find answers to frequently asked questions about e-Invoicing and the latest news in this area. We will keep you informed about the website launch.

Dear customers,
In the new edition of our newsletter, we bring you information about the most interesting events in the world of e-Invoicing for the month of April.

On Thursday, 23 April 2026, we organised the first of our planned webinars on the topic of e-Invoicing in Slovakia. The meeting took place via Microsoft Teams. We presented our mib:Peppol solution and our service offering for implementing mandatory e-Invoicing in participants' organisations.

We designed this solution to be as universal as possible, covering three areas:

• 1 Integration of SAP systems into the Peppol network.
• 2 Integration of non-SAP invoicing systems into the Peppol network — for both SAP customers and those using other systems.
• 3 Operation of our own certified Access Point (AP) for sending documents via the Peppol network.

mib:Peppol is built on a set of proprietary cockpits (for SAP and for AP) communicating via API interfaces. We chose a solution based on proprietary components to ensure maximum independence and flexibility.

Alongside our own solution, we also offer customers the option of introducing e-Invoicing through SAP DRC implementation, whose localisation for Slovakia is currently underway at SAP.

Participants were also presented with the following topics:

• legislative specifications
• basic prerequisites for use
• compatibility of solutions with customer systems
• comparison of features of our solution and SAP DRC
• comparison of business strategies, advantages and disadvantages

The webinar, which lasted approximately two hours, was attended by more than 70 participants. In addition to providing an overview of the solution, we answered many questions, and further communication is ongoing.

We completed certification, during which we successfully passed the following tests.

We have created the mib:Peppolbox web application for monitoring Peppol transfers. It also offers a clear overview of all received and sent Peppol documents passing through the Access Point (invoices, corrective invoices, SK Tax Data Document, Message Level Status). It also includes transport logs from the Access Point — complete document lifecycle, document visualisation and export in XML and PDF formats, as well as an Integration REST API.

During May we will carry out end-to-end tests of our solution in an internal testing environment and at the end of the month we will conduct pilot tests in a customer system.

As part of our partner programme, we are also building a partner ecosystem, where we are currently in discussions with the first four partners regarding cooperation on the distribution and implementation of our mib:Peppol solution.

What's new in SAP DRC — The currently communicated release date for the Slovakia solution is October 2026 for on-premise versions and November 2026 for SAP S/4HANA Public Cloud. Until the official release by SAP, you can use the detailed SAP DRC Cloud Edition documentation on BTP.

Access to the SK SMP testing environment from the Financial Administration of the Slovak Republic is currently planned for the second half, or even the end, of May 2026. The exact date has not yet been finally confirmed and will depend on the readiness of the environment on the part of the Financial Administration.

Representatives of the Financial Administration of the Slovak Republic, at a joint meeting with economic software manufacturers and so-called Digital Postmen, provided information about a planned legislative amendment by the Ministry of Finance of the Slovak Republic. This amendment would abolish the obligation to report data to the Financial Administration for every received invoice on the part of the recipient's access point. The obligation to report data to the Financial Administration would be retained only for the sender's access point.

At the same time, this legislative change should abolish the obligation for property lessors (e.g., flat owners) to register in the Peppol network and receive invoices electronically.

Adoption of the legislative change is expected in autumn of this year.

On 22 April 2026, representatives of Mibforma a.s. attended the 19th General Assembly of the OpenPeppol organisation. This year's General Assembly confirmed that the Peppol network is experiencing unprecedented global growth and is transforming from a European tool into a key global digital infrastructure.

Dear customers,
Based on your interest, we have prepared this first Newsletter on the topic of eInvoicing.

Our company was one of the first to be registered in the list of certified delivery service providers operating in the territory of the Slovak Republic.

The customer can choose one of two solution alternatives that we can implement. For SAP ERP customers preferring the standard approach, i.e. SAP Document and Reporting Compliance, we can provide both licensing and implementation. Licensing is on an annual basis in packages of 10,000 issued and received e-documents.

In the case of our solution, in addition to certification, we have implemented automatic sending and receiving of e-invoices in the Peppol network (Invoice, Credit Note including self-billing), document validation according to EN 16931 and Peppol BIS Billing 3, generation and sending of Tax Data Document (TDD) to the Slovak Financial Administration system, and sending of Message Level Status (MLS) delivery and validation confirmations.

You will find the road map in the attachment to this Newsletter.

On 20 April 2026 we organised a webinar at which we explained our approach to the solution and the implementation process.

The webinar covered:

• Scope of functionality
• Implementation process
• Procedure in case of problematic situations
• Costs associated with deploying and operating the solution

Date: 20.4.2026 at 09:00

Venue: MS Teams (the link to join was sent no later than one week before the event)

The webinar was conducted in Slovak.