01
Revenue lost to failed cards
Expired and declined cards quietly cancel subscriptions without anyone noticing.
09 · Software Development05 of 06
Stripe checkout, plans, trials, invoices and failed-payment recovery, built properly from day one.
Billing looks simple until you handle upgrades, refunds, taxes, failed cards and annual plans. We build payments and subscriptions properly with Stripe, so customers can buy and manage their plans themselves, failed payments are recovered automatically and your finance team gets clean data.
- Strong customer authentication ready
- SCA
- Strong customer authentication ready
- Of billing events tested before launch
- 100%
- Of billing events tested before launch
- Billing portal for customers
- Self-serve
- Billing portal for customers
£48
Add to bag
1
1Plan
2Card
3Active
Order confirmed
StripeCheckoutSubscription plansFree trialsUpgrades and downgradesInvoices and taxFailed payment recoveryCustomer billing portalStripeCheckoutSubscription plansFree trialsUpgrades and downgradesInvoices and taxFailed payment recoveryCustomer billing portal
Sound familiar?
The problems we hear most often before someone asks us about payments & subscriptions.
02
Billing handled by hand
Upgrades, refunds and invoices take staff time and create errors.
03
Tax and compliance worries
VAT, invoices and strong customer authentication rules are easy to get wrong.
What's included
01
Pricing setup
Plans, prices, trials, discounts and currencies configured in Stripe.
02
Checkout
A fast, trusted checkout with wallets and strong customer authentication.
03
Plan changes
Upgrades, downgrades and proration handled automatically.
04
Billing portal
Customers update cards, change plans and download invoices themselves.
05
Dunning
Smart retries and emails that recover failed payments.
06
Finance integration
Invoices, tax and revenue data synced with your accounting.
How we do it
You follow every step live in Mission Control, your project dashboard: tasks, files, approvals and a launch forecast.
- 1
Model pricing
Plans, trials and billing rules agreed.
- 2
Build
Checkout, webhooks and account logic implemented and tested.
- 3
Test every case
Upgrades, refunds, failed cards and edge cases tested in Stripe's test mode.
- 4
Launch
Go live with monitoring of payments and webhooks.
SCA
Strong customer authentication ready
100%
Of billing events tested before launch
Self-serve
Billing portal for customers
Built for
Who this is for.
SaaS products launching paid plans
Membership and subscription businesses
Products moving from invoices to card payments
Teams with fragile billing code
Tools we useNext.jsNode.jsExpressPostgreSQLPrismaStripeAWSSupabase
Questions
Payments & subscriptions, answered.
Something else on your mind? Ask the Zelvorm Concierge in the corner, or talk to the team.
Stripe has excellent subscription, invoicing, tax and payment method support, strong documentation and handles most compliance requirements. We can work with other providers when needed.
More in Software Development
The rest of the toolkit.
- 01SaaS MVPsA focused first version, built properly, launched fast and ready to grow with your first customers.
- 02Custom web applicationsPortals, platforms and business systems built around your processes, not the other way round.
- 03Internal tools & dashboardsAdmin panels, workflows and live dashboards that replace spreadsheets and manual reports.
- 04API design & integrationsClean, documented APIs and reliable integrations that keep data flowing between every system.
- 05Cloud architecture & DevOpsAutomated deployments, infrastructure as code and monitoring that keep your software fast and safe.
From the Journal
Read before you decide.
BookkeepingHow to Create an Invoice: Every Field Explained (With Examples)
What to put on an invoice, field by field: numbers, dates, line items, VAT and payment terms. Plus how invoices are recorded in your books and how to get paid faster.
6 Nov 2026 · 5 min read
E-commerce SolutionsCart Abandonment: 9 Fixes That Actually Recover Lost Sales
The average cart abandonment rate is roughly 70%. Here are nine specific, testable fixes that bring a meaningful share of that back.
24 Jun 2026 · 5 min read
Software DevelopmentWhat to Know Before Commissioning a SaaS MVP Build
Before you brief an agency to build your SaaS MVP, there are five decisions that will define the entire project. Here's what to settle first.
28 Apr 2026 · 6 min read
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