Fintech, Billing & Payment Rails

Secure subscription billing, multi-currency wallets, automated tax, and payout webhooks.

Engineering Overview

We build bulletproof financial infrastructure for SaaS companies, digital marketplaces, and eCommerce platforms requiring high-security transaction pipelines.

Standard Architecture Deliverables

Stripe Billing, usage-based metering, and tiered subscription webhooks

Idempotent payment webhook handlers with automated retry queues

Multi-currency conversion ledgers and tax calculation integration

Automated branded PDF invoice generation and reconciliation reports

Strict PCI-DSS compliance and financial data encryption standards

Our Build Process

Financial Flow Mapping

Model pricing tiers, usage metering, and currency routing.

Payment Rails Architecture

Set up idempotent webhooks, ledger tables, and retry logic.

Checkout & Invoicing UI

Design seamless checkout forms and billing management portals.

Security Audit & Launch

Run double-spend simulations, verify webhooks, and go live.

Sprint Tiers & Options

Select the engagement structure that matches your product timeline.

2–3 Weeks

Billing Integration

Complete Stripe checkout, customer portal, and invoice dispatch.

Subscription Tiers

Customer Portal

Automated PDF Invoices

Webhook Rails

6–8 Weeks

Custom Fintech Gateway

Multi-currency platform with custom ledger and escrow logic.

Multi-Currency Ledgers

Usage-Based Metering

Compliance Hardening

60 Days Support

Monthly

Fintech Retainer

Continuous ledger audits and new payment gateway additions.

Security Monitoring

Payment Gateway Expansions

Priority SLA