Silverflow and Griner partner to expand card payment processing across Europe

Amsterdam-based Silverflow and global payment processor Griner are joining forces to process card payments more broadly across Europe. The two companies announced the partnership on 16 September 2026. It builds on an earlier launch in Cyprus, where Griner was already using Silverflow's technology.

Silverflow provides the technical layer that enables other companies to process card payments. Its platform allows parties to handle card payments without having to build all the underlying technology themselves. For Griner, the partnership means it can expand its processing services in Europe without having to construct its own acquiring infrastructure from scratch.

The announcement comes at a time when Silverflow is active on several fronts. In March 2026, the company raised €37 million in a Series B round, and in June 2026 it opened a new headquarters in Amsterdam's Overamstel district.

What Silverflow does and who it serves

Silverflow, founded in 2019 by Anne Willem de Vries (CEO), Paul Buying (technology) and Robert Kraal (business development), focuses on parties that want to process card payments. Acquirers and merchants can connect to the platform via a single API. The company now processes nearly two million transactions per day, putting it close to one billion transactions on an annualised basis.

Clients include Deutsche Bank, mobility platform Bolt, payments company Payabl, and Dutch firm Buckaroo. With Griner, an international payment processor looking to expand its European reach is added to that list. The initial step in Cyprus serves as the starting point for a broader rollout across the continent.

Series B and new office in Amsterdam

In March 2026, Silverflow closed a Series B round of €37 million, equivalent to approximately $40 million. The round was led by Picus Capital. Rabo Investments, the corporate venturing arm of Rabobank, also participated, alongside existing investors Inkef, GPT, Crane and Coatue. Silverflow has raised a total of approximately $76.4 million across five funding rounds.

Three months after closing that round, on 1 June 2026, Silverflow opened its new headquarters in Overamstel, a busy district on the south-eastern edge of Amsterdam. At that point the company had over 100 employees, representing growth of more than 20 percent compared to the 85 people who had worked there previously. The company plans to grow to approximately 120 employees.

European rollout as the next step

The Cyprus launch was Griner's first experience with Silverflow's platform. The decision to pursue a broader European rollout through the same partnership indicates that the initial experience provides a sufficient basis for the next phase. Which specific European markets Griner intends to serve, and on what timeline, has not been disclosed.

For Silverflow, the partnership fits into a series of steps through which the company is strengthening its position in the European payments market. The combination of external funding, a growing client base and an expanding headcount suggests the company is building capacity to serve multiple large clients simultaneously.

The European landscape for payment infrastructure has become more attractive for specialist providers in recent years. Large banks and traditional processors are increasingly seeking technology partners rather than developing everything in-house, creating openings for companies such as Silverflow. For other Dutch fintech companies focused on infrastructure, this development illustrates that a step-by-step, market-by-market approach, starting with one country and scaling from there, can be a viable route to European growth.