Subscription Billing Software
Recurring revenue that bills itself and reconciles itself.
We build subscription billing: plans and add-ons, recurring invoices with GST, payment mandates and retries, upgrades and proration, dunning, cancellation handling and revenue and churn reports.
- Plans and add-ons
- GST invoices
- Payment retries
Free 30-minute call with a senior specialist. Reply within one business day. Based in Jaipur, working with businesses across India.
- Discovery callFree 30 minutes with a senior specialist
- Scoped first phaseWritten scope, timeline and fixed price
- Build with weekly demosWorking software you can see every week
- Launch and supportGo-live with your team ready, then ongoing support
What is subscription billing software?
Subscription billing software manages plans, recurring invoices, payments, upgrades and cancellations for businesses with recurring revenue. Stack18 builds it for Indian rules, including GST invoices and recurring payment mandates through payment partners, with retries, dunning and revenue reports.
Last reviewed 30 October 2026 by the Stack18 delivery team in Jaipur. Security and AI governance · Pricing · About Stack18
| What it covers | Plans and pricing; Billing and invoices; Payments and recovery; Customer self-service; Revenue analytics. |
|---|---|
| Typical first step | Discovery Sprint: 2 weeks, fixed price. |
| Build route | Fixed-scope first release: agreed in discovery; fixed price after discovery. |
| Long-term option | Transformation Pod: 12–36 months, annual contract. |
| Measured by | Failed payment recovery; Invoice errors; Billing admin hours; Churn rate. Each against an agreed baseline. |
| Governance | Human approval at 5 governance gates before anything reaches production. NDA available on request. |
| Delivery team | Based in Jaipur, India. A senior specialist replies within one business day. |
You need this when…
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Subscription Billing Software, end to end.
Each capability is delivered by the same team on the Agentic SDLC, with your approval at every critical step.
Plans and pricing
Flexible commercial models.
- Plans, tiers and add-ons
- Usage-based pricing
- Trials and coupons
Billing and invoices
Correct and on time.
- Recurring invoices with GST
- Proration on changes
- Credit notes
Payments and recovery
Collect more of what is due.
- Recurring payment set-up
- Retry and dunning
- Payment links
Customer self-service
Fewer support requests.
- Plan changes and cancellation
- Invoice downloads
- Payment method updates
Revenue analytics
Know the health of the business.
- MRR and churn
- Cohort retention
- Reconciliation
A typical engagement, step by step.
Senior people lead every phase. Specialised AI agents on the Agentic SDLC handle the repetitive work, and nothing ships without your approval.
Discovery
Map how subscription billing works today, the systems and data involved, and agree the first measurable outcome.
Design
Design the workflows, roles, integrations and approval points for subscription billing.
Build in weekly demos
Your team sees working subscription billing software every week, with changes agreed in the open.
Launch and support
Data migration, training, go-live support and a measured 30-day review against the baseline.
Start small. Scale when it works.
Every engagement begins with a short, fixed-price step so you can judge the fit before committing further. See pricing.
Discovery Sprint
Teams deciding scope and priorities before they commit.
- Duration
- 2 weeks
- Pricing
- Fixed price
- Scoped plan and timeline
- Team and fixed price
- Process map or prototype
Fixed-scope first release
Teams that know what they need built.
- Duration
- Agreed in discovery
- Pricing
- Fixed price after discovery
- Written scope and acceptance criteria
- Weekly demos
- Handover with documentation
Transformation Pod
Multi-system programmes that run for years.
- Duration
- 12–36 months
- Pricing
- Annual contract
- Dedicated cross-functional team
- Quarterly business reviews
- One accountable partner
What we have shipped, and what a typical engagement looks like.
Delivered projects link to the full case study. Illustrative scenarios describe typical engagements and are not named client results.
SaaS startup
- Challenge
- Renewals invoiced by hand; failed payments not followed.
- What we do
- Billing with retries, dunning and GST invoices.
Scoped in a 2-week sprint
Free subscription billing review
Tell us where subscription billing hurts most. We map what to fix first, whether ready-made or custom fits, and a realistic first step.
- Where to start and why
- Ready-made vs custom view
- Indicative timeline
We agree targets before we start.
Every engagement has a baseline and a target on the measures that matter to you, reported at every read-out.
Subscription Billing Software questions.
Do you support recurring payments in India?
Yes, through payment partners that offer recurring mandates. Rules and limits change, so we confirm current requirements with your provider.
Can it handle usage-based billing?
Yes. Usage is metered and billed with plan rules.
Does it integrate with accounts?
Yes. Invoices and receipts post to Tally or your ERP.
Can we migrate existing subscribers?
Yes. We migrate plans, balances and mandates where the payment partner allows.
Is it custom or a product?
Custom, scoped in a two-week Discovery Sprint.
Often combined with.
Razorpay Integration
Payments and reconciliation.
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Read →Let's scope your Subscription Billing Software project.
Tell us where you are and where you want to be. A senior specialist will reply within one business day with next steps.
- Free 30-minute consultation
- Indicative estimate after the call
- NDA available on request