Will the black box be removed in GKS 2.0? No: this is what FDM 2.0 does

The Federal Public Service Finance refers to this component as a Fiscal Data Module (FDM), often called a “black box” in practice. In GKS 2.0, the cash register communicates with an updated FDM via a new protocol. That module transmits receipt details online to the government’s cloud server.

12 Tests Every Payment Integration Must Pass

Payment issues are often rare but have a significant impact. A customer might pay twice, an order might remain open by mistake, or a refund might only be visible in one system. With a fixed test set, you can make these exceptions predictable.

Securely Managing API Keys for Payments: Practical Guidelines

Payment integrations do not always use a single API key in the literal sense. Some providers use client IDs, secrets, certificates, or OAuth. The security principle remains the same: only the appropriate applications and people are granted the minimum necessary access.

How does a connection between a point-of-sale system and a payment terminal work?

Behind that simple experience lies a stream of messages between the point-of-sale software, the terminal, and the payment provider. When that stream is well-designed, it speeds up the checkout process and makes discrepancies easier to trace. If exceptions are missing, however, a network problem can actually lead to duplicate or uncertain payments.

Reduce No-Shows with Reminders and Advance Payments

Not every missed appointment is due to a lack of willingness. A customer might write down the date incorrectly, be unable to find the link to make changes, or miss a communication. So start with the basics before requiring a large deposit for every reservation.