FlatDun: Architected for 100% EU-based node hosting and complete GDPR / DSGVO compliance at production launch. Real-time in-app payment enforcement.

Stop sending dunning emails that end up in spam.

Intercept failed cards at the session runtime.

Traditional dunning is passive. Customers ignore emails, workarounds break, and external redirects leak conversion. FlatDun is a headless, runtime-enforced revenue recovery engine. The exact millisecond a card fails, FlatDun locks the user session and enforces real-time billing updates directly inside your app UI layout context.

atomic_middleware_install.sh
// Install the headless runtime middleware engine

$ curl -s https://api.flatdun.com/install | sh

Join the Closed Beta

Strictly capped to the first 50 bootstrapped founders ($2k–$30k MRR).


The Architectural Difference

Why Passive Email Dunning is Dead

When an invoice payment fails, legacy tools wait days to send a polite automated email sequence. The user ignores it or it hits a spam filter. Meanwhile, your app keeps serving traffic, consuming database rows, and generating server costs. A week later, they churn silently.

FlatDun evaluates failed payments directly within your runtime context. The user cannot bypass the billing prompt, forcing an immediate interaction to recover your revenue stream.

[01]
Runtime Interception

Listens directly to real-time Stripe webhooks and catches route changes instantaneously via local application middleware.

[02]
Session Lockout

Generates a native UI layout overlay. Locks out operations securely until subscription credentials update successfully.

[03]
Headless Freedom

Emits clean, descriptive JSON packets. Natively handles state across Web, React Native, and Flutter codebases seamlessly.

The Hard Mathematical Reality of Billing SaaS

Alternative dunning platforms demand 1% to 2% of your hard-earned recovered cash, or trap you in MRR brackets that spike aggressively to $149 or $349/month as your business grows. They did not build your application, yet they levy an ongoing tax on your volume.

Flat $29/month utility. No tiered traps. No revenue taxes. If it saves one single customer per year, it pays for its entire annual operating footprint.