Flowin

Flowin combines a reliable and scalable Peppol platform with excellent support. Integration is flexible and straightforward, pricing is competitive, and the platform handles the complexity of electronic invoicing for us. It has proven to be very stable in daily use and scales easily to tens of thousands of businesses. What really sets Flowin apart, however, is the team behind it: knowledgeable, responsive, and always willing to help with both technical and regulatory questions.

There is very little to dislike. If I had to mention one area for improvement, it would be expanding support for businesses in additional European countries. As e-invoicing adoption continues to grow across Europe, broader geographic coverage would make the platform even more attractive for software providers operating internationally. In addition, support for invoice format conversions and connectivity to e-invoicing networks beyond Peppol could further increase flexibility for companies serving customers across different markets and regulatory environments. These are opportunities rather than shortcomings, as the core platform already performs very well.

We have been using Flowin for several years to provide Peppol e-invoicing capabilities to our customers. As electronic invoicing regulations continue to expand across Europe, we needed a reliable way to send and receive invoices through the Peppol network without having to build and maintain that infrastructure ourselves. The main benefits have been reliable invoice delivery, a straightforward implementation process, and the ability to scale efficiently across tens of thousands of businesses. Over the years, Flowin has proven to be a stable and dependable platform that handles the complexity of the Peppol ecosystem for us. This allows us to focus on developing our software and supporting our customers, while keeping operational overhead and support issues to a minimum.

Developer-Friendly REST API - The API design is highly intuitive, clean, and developer-friendly. Thanks to thorough documentation and well-structured JSON payloads, integrating their endpoints into our existing ERP software only took a few days. Anyone familiar with RESTful architectures will find the learning curve virtually non-existent. Onboarding new clients onto the Peppol network is often a major bottleneck due to strict verification and Know Your Customer (KYC) requirements. Flowin elegantly streamlines this process. The automated validation checks and streamlined workflows significantly reduce the time it takes to get customers live and exchanging documents. Flowin's unique approach to managing the unexpected is truly exceptional. Instead of cryptic error codes, the API returns highly descriptive, actionable validation messages. In the event that a document fails Peppol syntax rules or lacks a mandatory field, the error response will provide a detailed explanation of the issue, including the specific element that is missing, enabling immediate programmatic or manual correction.

A minor limitation is its exclusive focus on API-driven functionality for software developers, which means there is no native, end-user graphical user interface (GUI) available initially. Therefore, users will need to design the user interface (UI) wrapper within their own application.

Flowin's core strength lies in its exceptional technical execution. The API is well-documented and easy to understand. A huge plus is the free sandbox environment that registers customers in the Peppol test network. This helped us tremendously in getting things started and validating everything with the customer's partner before going live. Flipping the environment variables to go live was effortless. The onboarding of new customers and updates to existing ones, as well as the handling of errors in submitted documents, are excellent.

What I like best about Flowin is how easy it is to integrate and maintain. The API is well designed, the documentation is clear, and the onboarding process for new customers is straightforward. We have successfully connected multiple customers and the platform has proven to be very reliable in daily use. Another strong point is that Flowin handles the complexity of the Peppol network, allowing us to focus on our software and our customers. Since implementing Flowin, we have not experienced any significant issues, which gives us a lot of confidence in the platform.

There is only one area where I see room for improvement. Some of our customers use Flowin exclusively for sending invoices, while incoming invoices are handled through another platform or directly by their accountant. Currently, there is no clear option to register a customer for outbound invoicing only. We found a workaround, but having separate inbound and outbound registration options would make the onboarding process more flexible and better suited to different customer workflows. Apart from that, our experience with Flowin has been very positive.

We use Flowin to provide Peppol e-invoicing capabilities within our own software platform. Flowin allows us to send and receive electronic invoices for our customers without having to manage the complexity of the Peppol network ourselves. The main benefits we have realized are a much faster implementation process, reliable invoice delivery, simplified customer onboarding, and reduced maintenance effort. Thanks to Flowin, we were able to offer a compliant Peppol solution to our customers quickly and efficiently. The platform has proven to be stable and dependable, which has significantly reduced support requests and operational concerns. As a result, we can focus on developing our software while relying on Flowin for the Peppol infrastructure.

We have been working with Flowin for years. The experience of connecting via Peppol has been excellent. Not to mention that, within the accounting sector, Flowin has opened up a document-exchange ecosystem for us. I highly recommend this solution to any software provider.

There are no downsides. When an issue does arise, Flowin often develops improvements within a more-than-reasonable timeframe.

Flowin enables our users to easily receive and send their electronic invoices.

What we appreciate most about Flowin is its reliability, ease of integration, and the quality of its Peppol infrastructure. Thanks to Flowin, we were able to quickly integrate Peppol exchanges into Mastery Pro and provide our customers with a smooth and efficient e-invoicing experience. The platform is stable, compliant with regulatory requirements, and has proven to be a trusted partner in supporting our growth.

We have not encountered any significant drawbacks. The platform is reliable, easy to use, and consistently meets our needs. The Flowin team is also responsive and attentive whenever support is required.

Flowin enables us to integrate complete Peppol e-invoicing capabilities into Mastery Pro, covering both outgoing and incoming invoices. Thanks to this integration, our customers can send and receive electronic invoices directly from their familiar working environment without having to worry about the technical complexities of the Peppol network. Flowin helps us deliver a simple, reliable, and compliant solution, making the transition to e-invoicing easier for our customers.

One word: rest. We have complete peace of mind knowing that our e-invoicing is running reliably and correctly. It allows us to focus on our core business without worrying about compliance or delivery issues.

The main limitation is the lack of support for a fully branded SMP. Having that option would give us more control over our identity and customer experience.

We were able to quickly introduce e-invoicing to our customers without heavy development or long lead times. Flowin enables fast onboarding, allowing our customers to start using e-invoicing almost immediately. As a result, they can efficiently benefit from improved automation, compliance, and faster processing.

Simple and very easy to use, clear documentation. Setup was done very quickly and a day after I was already sending e-invoices. I did already have the correct xml format to be used.

I haven't found anything so far to dislike, it works, haven't seen much downtime, but then again you do not use this every minute

I use it in my saas app for sending e-invoices over the peppol network and also for my own e-invoicing

Really easy to integrate, support of kluwer is reactive.Flowin made our Peppol onboarding effortless and rock-solid. seamless Peppol integration we fully trust.

Limited sandbox/test coverage makes validating Flowin integration a bit painfull.

Sending invoices over peppol. get invoice feedback. Flowin gave us compliant Peppol e-invoicing.

The API is not very difficult to understand. The commercial and technical support is good, with transparent pricing. There are many layers of security. Unlike some competitors, the pricing structure is clear and straightforward.

Sometimes for me the security feels like a bit too much. Sending an e-invoice is not as critical as, for example, making a payment. But better be safe than sorry.

The main advantage is that Flowin saves me quite some time. I don't need to build a Peppol Access Point myself, and I don't have to maintain it.

What I like most about Flowin is how easy it was to integrate into our existing system and how straightforward it was to build the connection. The API and documentation made it simple to develop and maintain the integration without unnecessary complexity. In addition, the customer support is excellent, they respond quickly and provide clear, helpful guidance whenever needed.

One area for improvement is the visibility into incoming Peppol messages and their statuses. It would be very useful to have more detailed insights into why an incoming invoice was rejected or not processed correctly. This would help us troubleshoot issues faster and provide clearer answers to customers when they ask about missing or delayed invoices.

Flowin helps us streamline the handling of Peppol invoices by providing a reliable way to receive and send Peppol Invoices.

What I like best about Flowin is its reliability. As our Peppol access point, Flowin helps us offer our customers a high-quality electronic invoicing service that is stable, efficient, and compliant.

There is nothing to dislike. Flowin is simple, reliable and always meets our needs,

Flowin helps us offer an affordable Peppol solution to our customers through [www.peppol-box.be](http://www.peppol-box.be), starting from €5 per month. It allows us to provide reliable, compliant electronic invoicing services in a simple and cost-effective way.

the people at Flowin are the main power of the company. I have the pleasure of working with them for PEPPOL (electronic invoicing legislation), which is quite a complex topic. The people at the company are always there for help or advice. The professionals at Flowin are easy-going and we do get in touch on a regular basis.

Maybe there are some minor concerns, but even then, they are very helpful and try to do what's possible. I would recommend defining the internal spokespeople very thoroughly with them, since they send a lot of different newsletters, that do all end up in different mailboxes in our company.

PEPPOL Access Point: offerring a PEPPOL connection to the clients using our ERP platform.

Flowin has proven to be a highly reliable Peppol-API for both sending and receiving e-invoices. Operational stability is clearly one of the strengths, something that is not always guaranteed with other providers in the market. The API runs smoothly, processing is consistent, and support is responsive when needed. A dependable backbone for professional e-invoicing workflows.

Flowin is not the cheapest option on the market, especially when starting with lower volumes. That said, the pricing remains reasonable compared to other providers, and the cost per user becomes more attractive as the customer base grows. For us, the reliability and operational stability justify the investment.

We use Flowin to ensure reliable and compliant Peppol invoice delivery and reception within Facturalia. This allows us to focus on improving our platform instead of troubleshooting invoice delivery issues.