# SaaS billing and subscription system development > A SaaS billing and subscription system manages plans, trials, upgrades and downgrades, seat and usage-based pricing, invoices, taxes, payment retries and revenue reporting. Infikey builds billing on top of Stripe Billing, Razorpay Subscriptions, Chargebee or Paddle, or a custom engine for complex pricing. Typical builds cost USD 15,000–60,000 depending on pricing complexity and markets. Pricing you can change without a code release, invoices that satisfy tax rules in every market, and fewer customers lost to failed payments. - **Budget:** USD 15k–60k (INR 12–50 lakh) - **Pricing models:** Flat, per seat, tiered, usage-based, hybrid - **Providers:** Stripe, Razorpay, Chargebee, Paddle - **Tax:** GST, UAE VAT, UK VAT, US sales tax ## Billing features | Area | Features | |---|---| | Plans | Monthly and annual plans, add-ons, free trials, coupons, grandfathered prices | | Usage | Metering events, aggregation, included allowances, overage pricing | | Changes | Upgrades, downgrades, seat changes with proration, pauses and cancellations | | Payments | Cards, UPI AutoPay, direct debit, invoices with bank transfer for enterprise | | Recovery | Smart retries, card updater, dunning emails, grace periods | | Invoices and tax | Compliant invoices, GST and VAT numbers, reverse charge, US sales tax through a tax engine | | Reporting | MRR, ARR, churn, expansion revenue, deferred revenue exports | ## Buy a billing platform or build your own? - **Use Stripe Billing, Razorpay Subscriptions, Chargebee or Paddle** for standard plans and seats. We integrate them deeply: in-app plan pages, entitlements, webhooks and reporting. - **Build a custom rating engine** when pricing depends on complex usage (API calls, compute, records processed), contracts with negotiated rates, or several payment providers by market. - **Merchant of record** services such as Paddle handle global sales tax for you, at a higher fee. Most products combine a provider for payments and invoices with custom entitlement logic in the app. Track the results with the [SaaS metrics calculator](https://infikeytechnologies.com/tools/saas-metrics-calculator), and see [payment gateway integration](https://infikeytechnologies.com/industries/fintech/payment-gateway-integration) for multi-gateway setups. ## Cost | Scope | Budget (USD) | Budget (INR) | |---|---|---| | Plans, trials and checkout on one provider | 15,000–25,000 | 12–20 lakh | | Seats, usage metering, dunning and revenue reports | 25,000–45,000 | 20–37 lakh | | Custom rating engine with multiple providers and enterprise contracts | 40,000–60,000+ | 32–50 lakh+ | These are planning ranges, not quotes. ## Project blueprint: Usage-based billing for an API product Based on the requirements we hear most often from buyers like this. An API company charges customers a flat monthly fee, while heavy users cost far more to serve than light ones. It wants usage-based pricing with included allowances, but its current billing setup only supports fixed plans. What we would build: - Usage metering from API gateway events, aggregated per customer - Plans with included allowances, overage tiers and annual commitments - Stripe Billing integration for invoices, cards and bank transfers - Customer dashboard showing usage, projected bill and alerts - Revenue reports for MRR, expansion and churn How success is measured: - Revenue per customer and expansion revenue - Gross margin per customer segment - Billing disputes and manual invoice corrections - Failed payment recovery rate ## Frequently asked questions ### Can we accept recurring UPI payments in India? Yes. UPI AutoPay and card e-mandates work through gateways such as Razorpay and Cashfree, within RBI rules on recurring payments, including pre-debit notifications. ### How do you reduce failed renewals? Smart retry timing, card updater services, in-app and email reminders before expiry, grace periods and easy payment method updates. Recovering failed payments is often the cheapest growth lever a SaaS has. ### Can we change pricing without developers? Yes. Plans, prices, trials and coupons are managed in an admin console or the billing provider dashboard, and the app reads entitlements rather than hard-coded plan names. ## Related guides - [SaaS development company](https://infikeytechnologies.com/industries/saas): Infikey Technologies builds SaaS products: multi-tenant web and mobile applications with subscription billing, user onboarding, role-based a... - [Payment gateway integration services](https://infikeytechnologies.com/industries/fintech/payment-gateway-integration): Payment gateway integration connects your website or app to a provider such as Stripe, Razorpay, PayU, Cashfree, Checkout.com or Network Int... - [LMS development company](https://infikeytechnologies.com/industries/education/lms-development): A learning management system (LMS) delivers and tracks learning: courses, video lessons, documents, quizzes, assignments, certificates, coho... - [Laravel vs Node.js for web application development](https://infikeytechnologies.com/compare/laravel-vs-nodejs): Laravel is a full-featured PHP framework with authentication, queues, admin tooling and database tools built in, which makes business applic... - [Hospital management system development](https://infikeytechnologies.com/industries/healthcare/hospital-management-system): A hospital management system (HMS or HIS) digitises hospital operations: patient registration, OPD and IPD, billing, pharmacy, lab, radiolog... - [Manufacturing software development company](https://infikeytechnologies.com/industries/manufacturing): Infikey Technologies builds manufacturing software: custom ERP, production planning and scheduling, shop-floor execution (MES), inventory an... - [Construction software development company](https://infikeytechnologies.com/industries/construction): Infikey Technologies builds construction software: project management and site progress apps, BOQ and cost control, procurement and material... --- Source: https://infikeytechnologies.com/industries/saas/saas-billing-subscription-system Publisher: Infikey Technologies Private Limited (software, mobile app, AI and cloud development; offices in India, UAE, UK and US). Last updated: 2026-10-19 Get an estimate: https://infikeytechnologies.com/contact Cost figures are planning ranges, not quotes. Final scope and price are confirmed after discovery.