Solution
Subscription Billing Development
Recurring billing that handles proration, failed payment retries and tax calculation correctly, using an existing billing platform as the base.
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Subscription billing looks simple until a customer upgrades mid-cycle and the invoice needs correct proration, or a card expires and the business needs a retry policy that recovers the payment without losing the customer over an honest mistake. Most homegrown billing systems collect quiet bugs in these edge cases, and the bugs surface as revenue leakage that goes unnoticed for months.
We build subscription billing on top of a mature billing platform in almost every case, wiring plan logic, usage metering, and dunning rules to your product rather than reimplementing what those platforms already handle well.
Scope
Core features
Plan and pricing tier management
Multiple plans, add-ons, and pricing tiers are configured without a code change for every pricing update, so a new tier or a price adjustment is a configuration task that needs no deployment.
Proration on upgrades and downgrades
Mid-cycle plan changes calculate a prorated charge or credit automatically, based on how much of the billing period has elapsed, rather than waiting until the next cycle to apply the new price.
Usage-based billing metering
Usage events, such as API calls or storage consumed, get metered and rolled up into the invoice alongside or instead of a flat subscription fee, for products priced on consumption.
Dunning management for failed payments
Failed charges retry on a defined schedule with customer notifications at each step, recovering a meaningful share of failed payments that would otherwise churn as an involuntary cancellation.
Invoice generation and tax calculation
Invoices generate automatically each billing cycle with tax calculated per the customer's jurisdiction, handling sales tax, VAT, or GST without a manual calculation per invoice.
Multi-currency billing
Customers can be billed in their local currency where the business supports it, with exchange rate handling managed by the billing platform rather than custom currency conversion logic.
A customer self-service billing portal
Customers can update their payment method, view invoice history, and change plans themselves, cutting the volume of billing-related support requests.
Revenue recognition reporting
Recognized revenue reporting reflects how billing periods and any usage-based components should be recognized under standard accounting practice, giving finance a report they can reconcile against the books.
Architecture
Choices that shape the build
Idempotent handling of billing lifecycle events
Subscription events such as renewal, upgrade, and cancellation get processed idempotently, since a billing platform may resend the same event and processing it twice would double-charge or double-credit a customer.
Proration accuracy across billing cycles
Proration calculations need to account for plan changes that happen more than once within a single billing period, which is where naive proration logic tends to produce a wrong invoice.
Dunning without losing the customer
Retry timing and notification wording are tuned to recover a failed payment without feeling like a collections process, since overly aggressive dunning can push a recoverable customer to cancel outright.
Tax compliance across jurisdictions
Sales tax, VAT, and GST rules differ by jurisdiction and change over time, so tax calculation is handled through a billing platform's tax engine rather than a manually maintained rate table.
Migrating existing customers when pricing changes
A pricing change needs a defined migration plan for customers already on an old plan, whether that means grandfathering them or a scheduled transition, rather than an abrupt change to their next invoice.
Revenue recognition matching accounting standards
Recognized revenue for subscription and usage-based billing needs to align with ASC 606 or the equivalent standard your finance team follows, which affects how billing data needs to be structured from the start.
Build vs buy
When to build and when to buy
Stripe Billing, Chargebee, Recurly, and Zuora are usually the right call outright for subscription billing, since they already handle proration, dunning, and tax calculation against edge cases that take years to get right independently. We recommend building on one of these platforms in almost every engagement rather than reimplementing core billing logic from scratch.
Custom logic is worth building on top of one of these platforms when pricing depends on usage metering unique enough to your product that the platform's native metering does not model it cleanly, or when billing state needs to integrate deeply with a broader in-house system, such as a custom entitlements engine that gates product features based on plan.
Delivery
How delivery is phased
Define the pricing model and billing rules
We document every plan, add-on, and usage-based component the business needs to bill for, along with proration and dunning rules specific to the business.
Integrate the billing platform and webhooks
The chosen billing platform gets integrated with idempotent webhook handling for subscription lifecycle events, tested against real plan changes and cancellations.
Build usage metering, proration, and dunning
Any usage-based metering and the specific proration or retry rules the business needs get layered on top of the platform's defaults. This typically takes a few weeks depending on pricing complexity.
Test against real billing cycles and launch
The system runs through at least one full billing cycle in a staging environment with realistic plan changes before going live with real customer billing.
Technology
Stack we usually choose
FAQ
Questions about Subscription Billing Systems
Should we use Stripe Billing or build custom subscription billing?
Stripe Billing, Chargebee, or a similar platform is the right foundation for nearly every subscription business, since they already handle proration, dunning, and tax calculation reliably. Custom work sits on top of one of these platforms rather than replacing it, focused on usage metering or business logic specific to your product.
How does proration work when a customer upgrades mid-cycle?
The system calculates the unused portion of the current plan and credits it against the new plan's prorated cost for the remainder of the billing period, so the customer is charged fairly for the exact time spent on each plan rather than the full price of both.
What is dunning management and why does it matter for subscription revenue?
Dunning is the process of retrying a failed payment on a schedule with customer notifications at each step. It matters because a meaningful share of failed payments are recoverable, from an expired card or a temporary insufficient funds issue, and good dunning recovers that revenue instead of letting it churn as a cancellation.
Can subscription billing handle usage-based pricing?
Yes. Usage events like API calls or storage get metered and rolled into the invoice alongside or instead of a flat fee, using the billing platform's native metering for straightforward cases or custom metering logic when usage tracking is specific to your product.
How do you handle sales tax and VAT across different countries?
Tax calculation runs through the billing platform's tax engine, which tracks jurisdiction-specific rates and rules for sales tax, VAT, and GST, rather than a manually maintained rate table that would need constant updates as rules change.
Services
Services this draws on
- API DevelopmentWe design, build, document and version REST and GraphQL APIs so partners can integrate without asking your engineers for help.
- Backend DevelopmentWe build the server-side systems beneath your product, including data models, business logic, queues and the infrastructure that keeps them fast under load.
- SaaS DevelopmentWe build multi-tenant SaaS products around tenant isolation, subscription billing and self-serve onboarding, architected to scale beyond your first cohort of customers.
- Custom Software DevelopmentWe build software around the processes your business already runs on, so operations no longer depend on spreadsheets, workarounds and tools never built for your workflow.
Industries
Industries that commission this
- Professional ServicesEngagement management, time tracking and client portals designed around how consulting and advisory firms bill for their time.
- Media & EntertainmentStreaming, subscription and rights management software organized around DRM licensing and content availability by territory.
- EducationLearning platforms and student portals driven by real rostering data and connected to Canvas, Google Classroom and your SIS over LTI 1.3.
- Fitness & WellnessClass booking, membership billing and wearable data sync for studios and gyms that have grown past Mindbody or Glofox.
Insights
Further reading
- 8 min readHow to Build an MVP and Skip the Wrong FeaturesA practical guide on how to build an MVP: scope the smallest viable version, validate demand, pick an engagement model, and avoid the usual mistakes.
- 7 min readWhat MVP Development CostsMVP development cost runs $15,000 to $60,000 for a single-workflow product, and $60,000-$150,000+ once billing or integrations come into play.
- 6 min readHow Long It Takes to Build a SaaS ProductHow long does it take to build a SaaS product? A focused MVP takes about 3-5 months and a full multi-tenant platform 6-10 months. See the breakdown.
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