Subscription software
Subscription software sells plans, charges the card every month or year, retries failed payments, issues invoices on schedule, and gives subscribers a portal for their plan, card, and invoices. Stripe Billing charges 0.7% of the amount billed; a custom system with Bulgarian invoices and your contract rules costs 3 000-29 300 € (based on 98 of our quotes as of 14 August 2026).
Ивелин КириловChief Technology Officer (CTO)
Владислав БарковManaging DirectorWhat it includes
- Plans
Monthly and annual plans, a trial period, discounts, and plan changes.
- Recurring payments
The card is charged automatically; if the payment fails, the system tries again and contacts the subscriber.
- Scheduled invoices
With the required details under Article 114 of the VAT Act, sequential numbers, and the tax base in euro.
- Subscriber portal
The plan, card, invoices, and cancellation, without emailing you.
- Contracts
A contract-based subscription with a monthly invoice and payment by bank transfer.
- Reports
Monthly recurring revenue, churned subscribers, and unpaid invoices.
How the process works
- 1The subscriber chooses a plan and pays by card, or the company signs a contract.
- 2Every month, the card is charged automatically and the invoice is issued on schedule.
- 3If the payment fails, the system tries again and sends a reminder, while you can see the revenue and churned subscribers.
Solution
Internet service provider
Subscribers, tariffs, network, maintenance requests, installations and invoices.
Price
€3,000-€29,300
most often around €8,600
Based on 98 of our quotes as of 14 August 2026
In short: Stripe Billing or a custom system
Saitami's subscription system sells plans, charges cards through Stripe, issues Bulgarian invoices on schedule and provides a subscriber portal. Stripe Billing charges 0,7% of the amount billed, but invoices under Article 114 of the VAT Act and bank transfer contracts remain outside it.
A custom system built around Stripe makes sense when invoices must follow Bulgarian rules with sequential numbers, some subscribers pay by bank transfer under a contract, plans are linked to a service (maintenance, internet, access), or subscriptions are part of a larger system.
Stripe Billing pricing
According to Stripe's page, read on 17 October 2026: 0.7% of the amount billed for usage-based payments, with no monthly fee. An annual contract is also available for large volumes. The fee for the card payment itself is charged separately.
What we have built so far
LiftexPro invoices elevator companies automatically, with card payments through Stripe. Saitami ERP issues our contract invoices, with an online page that the customer opens and pays on. We show subscribers, rates, and monthly invoices in the internet service provider demo, while our free invoicing software is on the invoicing page.
Timeline and price
A system with plans, recurring payments, scheduled invoices, and a subscriber portal costs 3 000-29 300 €, based on our quotes. Support costs 100-350 € per month and is optional.
What we have not done so far
We have not migrated subscribers from Chargebee, Recurly, or another subscription system while retaining their card details. If you have such subscribers, we check what Stripe and your current system allow before giving you a price.
Projects in the industry
Saitami ERP: the system we use to manage our sales, with calls, emails, quotes and invoices in one place
Software company
Our own ERP and CRM system: a priority-ranked task queue, browser-based calls with recording and transcription, emails prepared by AI according to our rules, quotes and invoices that clients can open and accept online, and recorded meetings with summaries. We build the same system to order for companies with sales and customer service teams.
LiftexPro
Elevators
SaaS ERP system for elevator companies, covering everything from inspection scheduling and building management to a mobile app for technicians and automatic invoicing.
What you gain
The payment repeats automatically
And retries when it fails.
Bulgarian invoices
With sequential numbers, on schedule.
The subscriber is served automatically
Plan, card and invoices in the portal.
How we get started
- 01
You describe the project
A few sentences about what you need are enough.
- 02
We come back with questions and a price
We ask 2-3 specific questions and tell you the price range.
- 03
We build a demo
For a website, store or software system, we build a demo made for you.
- 04
We send a proposal
A written proposal with the exact price. We meet only to discuss the solution.
Frequently asked questions
Subscription software: €3,000-€29,300, typically around €8,600. The exact price is included in the written proposal.
It depends on the scope, which we set out in the proposal. For comparison, here are examples from our portfolio: Pelikan DTM: since April 2026, continuously developed, Elite Call Center: 6 months, LiftexPro: 8 months.
Yours. We hand over the source code and data to you.
If you wish, we can maintain the project for €100-€350 per month. We specify what maintenance includes in the quote.
Integrations we have already built: Stripe, Stripe Billing, and bank payments. We check other integrations and include them in the quote.
Stripe Billing charges 0.7% of the amount billed. A custom system with Bulgarian invoices and a subscriber portal costs 3 000-29 300 €, based on our quotes.
The system tries again, contacts the subscriber and you, and stops the service after the period you choose.
Yes, on schedule, with the required details under Article 114 of the VAT Act and sequential numbers.
Yes, under a contract with a monthly invoice, with the payment recorded when the bank statement arrives.
Related software
Invoicing software
Invoicing software: a free online invoice with the details required under Art. 114 of the VAT Act, ready-made software and its pricing, the rules for invoices in euro, numbering and electronic invoicing from 2028, plus custom software with monthly invoicing and card payments.
Gym software
Fitness gym and studio software: subscriptions with card payments that renew automatically, group classes with limited places, trainers, visits and a member app. Gymdesk, PushPress and Fresha, with their prices as of 17.10.2026, and when a custom system makes sense.
Coworking software
Software for a coworking space, flexible office or business centre: memberships and pricing, desk and room bookings without overlaps, card payments, and monthly invoices for companies. OfficeRnD and its prices as of 17.10.2026, plus when a custom system makes sense.
Related Services
ERP System Development
Custom ERP system development for a small or medium-sized business: inventory, sales, invoices, production and reports built around your process, with the code and data in your hands.
API integrations
API integrations for businesses: we connect your website, store, ERP and CRM system with Econt, Speedy, Stripe, banks, telephony, Meta and your programs, so you do not have to re-enter data.
