With contributions from:
Mike Oliinyk
VP of Product
In a nutshell
Montonio provides payments, refunds, shipping, and BNPL to e-commerce businesses across the Baltics and Europe. Since their 2022 Series A, they've been expanding rapidly into new markets and product lines.
Challenge
Montonio's homegrown billing system couldn't keep pace with their expansion. New products, new countries, multiple entities, multiple currencies, as every addition meant more engineering maintenance and more invoice disputes.
Solution
Solvimon replaced their internal billing with a single platform handling multi-entity invoicing, currency conversion, and flexible pricing models. Engineering stopped maintaining billing. Finance got a system they could trust.
Montonio built their billing system in-house. It worked - until it no longer supported their growth.
The company was scaling fast: adding BNPL in Estonia, expanding across Europe, onboarding merchants at pace. Each new product and market added complexity. Multi-entity billing. Multi-currency invoicing. Percentage-based transaction fees layered on subscription minimums. Their internal system required constant maintenance, pulling engineering resources away from product work.
Challenge
Invoice disputes were climbing, with edge cases requiring manual intervention.
As they scaled, the team needed a single source of truth that product, finance, and sales could all rely on and most importantly without building it themselves.
Montonio evaluated their options: keep investing in the homegrown system or switch to a billing platform built for this complexity.
They chose Solvimon.
Solution
The deciding factors were specific, but Solvimon already handled the pricing patterns Montonio needed:
Subscription fees
Invoice minimums
Multi-entity support
Built by the team that scaled Adyen's billing infrastructure, Solvimon understood payments businesses natively.
"Working with Solvimon feels like having colleagues just working from another office. They deeply understand which problems we are looking to solve today and in the future. It's been a pleasure to work and collaborate with them."
— Mike Oliinyk, VP of Product
Impact
Within the first month, Montonio was processing 10,000+ invoices through Solvimon. Invoice-related support issues dropped 35%. Engineering hours previously spent on billing maintenance shifted back to product development.
Montonio also started using Solvimon's cost prediction feature, an event-level forecasting for payment processing costs. For a payments company managing tight margins across multiple products, that visibility matters.
The outcome: billing became infrastructure they use, not infrastructure they build.
By the numbers
10K
+
monthly customer invoices
35
%
reduction in invoice-related issues
Still building billing in-house? Talk to us.
