Author: Marek Stopka5 min read

Recurring billing for Vertical SaaS - how to give your clients subscriptions without building your own engine

Your clients are asking about monthly memberships and subscription plans. Building your own engine is 6-12 months and 200-500k PLN. Forcing PSP migration creates friction merchants don't want. There's a third path - and in this post I show how it works.

Recurring billing for Vertical SaaS - how to give your clients subscriptions without building your own engine

You're building SaaS for Polish service businesses. Fitness, beauty, education, healthcare. Your clients - studios, clinics, schools - sell recurring services. Memberships, monthly plans, passes. And they're increasingly asking you the same question: can this be automated? Instead of a one-time pass, can I have a monthly subscription that renews itself?

I know this question well, because we talk to the same businesses. And I know that as a Vertical SaaS founder, you currently have three options - each with its own cost.

Why recurring billing isn't yet standard in Polish Vertical SaaS

Not because nobody wants it. Because it's harder than it looks.

Building your own billing engine is realistically 200-500k PLN in investment, 6-12 months of time-to-market, and a dedicated team that has to simultaneously handle PSP integrations, retry logic, compliance, and subscription lifecycle management. Most founders run the numbers, push it back, and return to building the core product.

The alternative is reaching for a ready-made solution from a Western player. Technically solid, well-documented - but built for a different market. No BLIK Recurring, no retry logic tuned to Polish banks, no native integration with Polish accounting. And most importantly for your business - to use it, your merchant has to switch to a different PSP. But most of your clients already have negotiated rates with Tpay, PayU, Przelewy24 or Autopay. Telling them "change your gateway" is a conversation nobody wants to have.

I've seen how that conversation ends. The merchant stays on the old solution - or starts looking for a different SaaS.

Three paths you have today

How it works technically

Here's the key thing I want you to understand before we go further.

Zevio works on top of your merchants' existing PSP - no migration, no switching.

Your Vertical SaaS application
           ↓
  Zevio recurring layer
  (subscription lifecycle, retry, analytics)
           ↓
  Merchant's PSP
  on merchant's own MID and negotiated rates
           ↓
  End customer pays via BLIK or card

The merchant stays on their own MID, with their own rates. We add a subscription management layer on top of what's already working - handling the subscription lifecycle, failed payment retry, webhooks, an analytics dashboard, and BLIK Recurring as a native payment method.

Integration on your product's side is REST API and webhooks. Merchant onboarding - 15 minutes. The embedded checkout runs under your brand - your merchant and their end customer never leave your ecosystem.

What you gain as a Vertical SaaS founder

A new feature in your product without your own dev. You don't build a billing engine, you don't hire a compliance officer, you don't debug retry logic at 2am. You embed Zevio via API and have recurring billing ready for production.

Rev-share on your clients' volume. Every subscription transaction processed through Zevio generates revenue for you. The more merchants you activate, the higher the passive income.

Merchant retention. A merchant who has working recurring billing integrated into your product doesn't leave the platform. Switching cost grows dramatically the moment their clients' subscriptions live inside your system.

Roadmap alignment. You don't adapt to a global SaaS roadmap. You talk to us about what your specific segment needs - fitness, beauty, edu, medical - and we build it in.

What your merchant gains - example with numbers

I'll show this with a concrete example, because numbers say more than description.

Fitness studio: before and after

A fitness studio with 250 active clients. A one-time pass at 320 PLN, averaging 3 passes per year per client. 40% of clients don't finish their pass. 30% don't come back after it expires.

Effective annual revenue: around 77k PLN.

After introducing a monthly subscription through Zevio: 150 clients on a 280 PLN monthly plan. Annual revenue: around 134k PLN. A 75% increase - at a lower monthly price for the client.

On top of that, several effects that don't show up in the basic model. Seasonality flattens - July and August stop being a dramatic low, because recurring payments come in regardless of attendance. The LTV of a recurring client is 8-12 times higher than a one-time buyer. A win-back agent automatically recovers 60-70% of failed payments before they become churn. The front desk stops handling manual debt collection.

These are mechanisms we see with our clients - not marketing projections.

What this looks like in practice - the Tygodnik Powszechny case

The best-documented case I can show comes from the publishing market. But the mechanics are identical to fitness or education.

Tygodnik Powszechny - one of Poland's most respected weekly magazines - launched subscriptions through Zevio on 23 March 2026. In 81 days it reached 377,746 PLN ARR run-rate and a fourfold increase in net new MRR. Paywall conversion grew more than fivefold - from 0.21% to 1.18%. In a direct comparison, BLIK cohorts through Zevio converted 10 percentage points better than parallel cohorts on another billing engine - with an identical product and price.

Tygodnik Powszechny is now the fastest-growing opinion weekly in Poland - +66.9% in digital subscription sales year-on-year, according to ZKDP data confirmed by Wirtualne Media.

The full case study is available here.

Partnership models

We work with Vertical SaaS in three models.

Referral - the simplest start. You refer Zevio to your clients and receive rev-share on their volume. No technical integration required on your side.

Embedded - full API integration. Recurring billing runs inside your product under your brand. Your merchants see your platform, not Zevio. This is the model for founders who want recurring billing as a full product feature.

White-label - for platforms with their own merchant base and a need for full UX control. We discuss individually.

Every model comes with joint go-to-market, co-marketing, and engineering support during integration.

If you're building Vertical SaaS for Polish service businesses and want to give your clients recurring billing without switching PSPs - I'd love to talk.

Become a partner