Service areas 05–06 — Payment systems and billing

A payment system that
won't break your business when things fail

When a standard payment provider is no longer enough, we build custom payment infrastructure around your product's logic: billing, payment gateway, crypto / fiat flows, routing, and fallback scenarios.

Review my payment setup View case studies
When you need this

When standard solutions are no longer enough

🔗

Dependence on a single providerWhen it goes down or imposes limits, revenue goes down with it. The business needs its own routing and fallback scenarios — not hope that one partner stays stable.

🧩

Multiple channels with no unified logicCrypto and fiat run separately, statuses drift apart, and support untangles disputed payments by hand. A single management layer is needed.

🔄

Subscriptions and recurring payments misbehaveRenewals are unreliable, billing logic is smeared across the code and the provider's dashboard, and recurring scenarios need constant workarounds.

📉

Payments get lost on failuresSome transactions hang in an undefined state, callbacks arrive late or duplicated, and reconciliation takes manual work every day.

🌍

Different regions, different channelsCustomers in different countries want different payment methods. There's no system that can pick a route and switch when a channel is down.

🚀

The product grows, the payments layer doesn'tAdding a new provider or pricing model turns into a mini-project with the risk of breaking existing logic. The architecture isn't ready for growth.

What we build

Not an integration — a complete payment system

A good payment system is not a bundle of connected APIs

The problem with most payment setups isn't that they don't work. They do — as long as everything follows the happy path. They break at the edges: a delayed callback, a temporary provider outage, a duplicate transaction, a conflict between a blockchain event and business logic.

We build payment infrastructure with an explicit state model, idempotency, retry logic, DLQ, and fallback routes — so the system behaves predictably even in imperfect scenarios.

That means the team can see transactions move, support doesn't operate in manual mode, and billing logic lives inside the system instead of being smeared across code and provider dashboards.

What the system includes

Custom payment gateway — a single entry point for all payment operations
Billing system — subscriptions, invoices, balances, recurring payments
Crypto / fiat flows in a single architecture
Routing and failover across multiple providers
Statuses, callbacks, reconciliation, and error handling
Idempotency, retry mechanisms, DLQ, and circuit breaker
Admin tools for support, oversight, and the operations team
What the business gets

Payment infrastructure as a foundation for growth

01

Less dependence on a single provider

Routing across multiple channels plus fallback scenarios — one provider's outage doesn't stop the money flow.

02

Fewer losses to failures and mismatches

Retry logic, idempotency, and DLQ — transactions don't get lost at the edges. Disputed cases go into a queue, not a manual review.

03

Predictable billing

Subscriptions, renewals, expirations, and recurring payments follow one set of rules. The logic lives in the system, not in a developer's head.

04

Crypto and fiat in one system

Different behavior models, confirmation speeds, and finalization rules — all handled by a single layer without a zoo of special cases.

05

Operational control

The team sees transaction flow, statuses, errors, and routes in one place. Support stops working by hand in provider dashboards.

06

Ready for growth

A new provider or pricing model is an architecture extension, not an emergency refactor. The payments layer doesn't hold back scaling.

Our work

Completed projects

Case 01

Crypto payments and subscriptions in Telegram — non-custodial architecture, automated access delivery, production-ready

The task

The client needed their own payment system for a Telegram product with subscription-based access. Standard solutions didn't fit: high fees, geographic restrictions, manual access management. An additional requirement was a non-custodial model: funds go directly to the owner's wallet, with nothing held inside the system. Payment acceptance, network monitoring, subscription management, and automated access delivery had to be assembled into one system — protected against duplicates, race conditions, and losses on failures.

What we did

We designed payment infrastructure, not just a "bot with payments". The system included: a Telegram Bot, a Payment Module, a Blockchain Listener for the Base network, a Subscription Module, an Access Module with automated issuing and revoking of invite links, and PostgreSQL + Redis for locks and queues. We built in idempotency keys, unique amounts for matching transfers, a 12-confirmation threshold, distributed locks, DLQ, a circuit breaker, and a retry policy. In v2 — a Web Admin Panel with metrics, transactions, and an audit log.

Stack

Python · FastAPI · aiogram · PostgreSQL · Redis · Base Network · USDT / cbBTC · Blockchain Listener · Idempotency · DLQ · Circuit Breaker · Distributed Locks · Web Admin Panel

The client got their own payment system for a Telegram product: crypto payments arrive directly, subscriptions and access work automatically, and the architecture is ready for production operation and scaling.

Case 02

Payment infrastructure for a SaaS — multiple providers, billing logic, managed statuses

The task

A product with active sales, but the payments layer started breaking under load. Some payments hung in an undefined state, subscriptions renewed unreliably, support untangled disputed charges by hand, and the final money picture was assembled from several provider dashboards. The problem wasn't "add one more payment method" — a single layer on top of multiple providers was needed.

What we did

We assembled a payment architecture with a single gateway as the entry point and a routing layer distributing across providers with fallback routes. The billing system took over subscriptions, plans, invoices, and recurring payments. All status handling was reduced to a single payment lifecycle model. Callbacks, retries, and error handling were moved into a managed layer. The team got an operational interface for transactions, disputed cases, and manual actions.

Stack

FastAPI · PostgreSQL · Redis · Payment Gateway · Multi-Provider Routing · Fallback Scenarios · Billing Engine · Subscriptions · Recurring Payments · Callback Processing · Reconciliation · Admin Panel

The payments layer went from "a set of integrations that periodically break" to a managed system. The business gained control over statuses, routes, and the transaction lifecycle.

Case 03

A unified system for crypto / fiat flows — routing, fallback scenarios, operational control

The task

A product with customers across regions: some pay in crypto, some in fiat. Everything was handled piecemeal — one channel for some, another for others, part of the operations by hand. As transactions grew, it became clear: what was needed wasn't one more integration, but a system that unifies channels under one logic, can switch to a fallback scenario, and gives the team visibility into statuses and money movement.

What we did

We assembled a single payment layer for different payment types. We designed the logic separating crypto and fiat flows without breaking the business process. We set up rule-based routing and fallback scenarios for channel outages. We introduced a single model of statuses and events for the product and the team. We implemented callbacks, retries, disputed-case handling, and an internal operations layer for transaction control.

Stack

FastAPI · PostgreSQL · Redis · Crypto Payment Processing · Fiat Gateway Integration · Unified Payment Layer · Multi-Channel Routing · Failover Logic · Status Lifecycle · Callback Handling · Reconciliation · Operations Dashboard

The business stopped depending on the accidental resilience of individual channels. Crypto and fiat are unified in one architecture, routing is manageable, and support sees a single stream of operations.

Who it's for

Who comes to us with this

📱

Monetized Telegram products

Bots, private-access channels, mini apps. They need crypto acceptance and subscription management without manual work or dependence on Telegram Payments.

💼

Subscription SaaS

The product grows and billing logic gets more complex. They need a system that handles subscriptions, renewals, and plans without constant rework for every new scenario.

🌐

Products in multiple markets

Different regions, different payment methods. They need channel routing, fallback scenarios, and unified status logic regardless of the provider.

💱

Crypto-native projects

They need non-custodial crypto acceptance, network monitoring, transaction confirmation, and automated logic — without centralized custody of funds.

🏢

Businesses with an operations team

Support is drowning in manual payment checks. They need an operational interface where transactions are visible, disputed cases are manageable, and manual actions are minimal.

⚡

Projects with a setup that exists but doesn't work

Payments come through, but unreliably. Statuses drift, some transactions get lost, billing behaves unpredictably. The architecture needs a review and a rebuild.

Budgets

Cost reference points

Below are reference points for typical tasks. If a project involves non-standard logic, multiple providers, crypto / fiat flows, billing, routing, or fallback scenarios, the cost is estimated individually after a short technical review.

01

Payment setup review

from $500
A good fit if you need to understand why the current setup is unstable, assess the risks, and decide: patch it or build new.
  • Review of the current payment logic
  • Analysis of providers, statuses, callbacks, and bottlenecks
  • Architecture recommendations
  • Preliminary estimate of timeline and budget
Request a review
02

Basic payment integration

from $2,500
A good fit for connecting one provider and assembling a basic working payment flow.
  • Integration of one provider
  • Order / invoice creation
  • Callback processing and signature verification
  • Basic success / failure payment logic
Discuss
03

Billing for subscriptions and recurring payments

from $4,000
A good fit for launching subscriptions, calculating validity periods, and setting up recurring scenarios.
  • Subscriptions / recurring payments
  • Renewal and expiration logic
  • Subscription statuses and billing rules
  • Basic admin logic
Discuss
04

Payment gateway / multiple providers

from $8,000
A good fit for unifying several payment channels and reducing dependence on a single provider.
  • Custom payment gateway
  • Routing across channels
  • Fallback scenarios and failover
  • Unified status and payment-processing logic
Discuss
05

Crypto / Fiat Payment System

from $12,000
A good fit for combining crypto and fiat in one system instead of several disconnected solutions.
  • Crypto / fiat payment flows
  • Unified status handling
  • Callbacks and reconciliation
  • Payout / balances logic
  • Admin and operations layer
Discuss
Full system
06

Full payment infrastructure

from $16,000
Your own payment system built for the product: billing, gateway, routing, and operational logic in one architecture, ready for load and growth.
  • Architecture design
  • Custom payment system
  • Billing + payment gateway
  • Routing, failover, and fallback scenarios
  • Statuses, callbacks, reconciliation
  • Admin tools for the team
  • Production launch preparation
Discuss a project
Not sure what exactly you need? Describe the task in your own words — an integration, billing, or your own payment system. We'll review the current setup, tell you whether it fits this service area, and propose a realistic option for timeline and budget.
Who we are

Who we are

Dmitrii

Backend / Architecture

Kseniya

Blockchain / Product

Albert

Backend / Smart contracts

7+
years in engineering
Web3
SaaS / Fintech
Global
clients across multiple countries
High
load and reliability

We build projects where mistakes aren't an option: payment systems, Web3, backend services, infrastructure, automation, high-load projects.

We don't do mass-produced websites or template solutions. We work on problems where stability, security, and the ability to scale actually matter.

  • you need a non-standard system built
  • you need the architecture reworked
  • you need an audit before launch
  • you need the project prepared for growth
  • you need complex business logic implemented
Talk to us directly
Get started

Have a project? Let's break it down

Tell us what's going on — we'll tell you whether we can help and what it looks like in terms of budget and timeline. No strings attached.

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