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Paul Walsh

API integration · Stripe

Stripe API integration

Stripe built around your business, not a plugin's limits. Custom checkouts, subscriptions with trials and upgrades, payments that unlock access automatically, and marketplaces that split money between sellers. Quoted up front, and you own the code.

  • From £1,295, agreed before any work
  • Webhooks that keep your system in step with Stripe
  • Tested in Stripe's test mode across every scenario

Get a quote

I'll reply within 24 hours with a price.

Your details are only used to reply to you.

Or WhatsApp / text 07398 946 380

Prices

Every project is different, so these are starting prices. You get a written quote before any work starts, then 50% to begin and 50% when you're happy with it.

One-time payments

Card payments in your own checkout

From

£1,2951–2 weeks

  • Stripe Payment Intents
  • Payment form built with Stripe Elements or Checkout
  • Webhooks for payments, failures and refunds
  • API keys kept on the server
  • Emails triggered by payment events
  • Card decline handling
Get a quote for One-time payments
Most popular

Subscriptions

Recurring billing with Stripe Billing

From

£2,4952–3 weeks

  • Everything in One-time payments
  • Plans, trials, upgrades and proration
  • Customer portal for self-serve changes
  • Smart Retries on failed payments
  • Access suspended on non-payment
  • Xero sync if you need it
Get a quote for Subscriptions

Connect marketplace

Platforms that split payments between sellers

From

£3,9953–4 weeks

  • Everything in Subscriptions
  • Stripe Connect accounts for your sellers
  • Platform fees and split payments
  • Seller onboarding and identity checks
  • Automatic payouts to sellers
Get a quote for Connect marketplace

Retainer

Optional, once the integration is live

From

£49per month

  • Stripe API version monitoring
  • Webhook health checks
  • Updates for breaking changes
  • Minor bug fixes
  • New features quoted separately
Get a quote for Retainer

What the Stripe API gives you

Stripe covers one-off payments, subscriptions, invoicing, marketplace payouts through Connect, fraud checks through Radar, and webhooks for every payment event. A custom integration uses the parts your business needs and connects them to your own system.

Who it's for

  • SaaS and subscription platforms Your own plans, trials, per-seat billing and upgrade paths, with access granted and removed by payment status. See Stripe subscription billing.
  • Marketplaces Customers pay the platform, and Connect splits the money between sellers and your fee automatically. See Stripe Connect for marketplaces.
  • B2B invoicing Invoices and payment links sent automatically from your client portal or internal tools, with payments matched when they arrive. Need it in your books too? See Xero and Stripe.
  • Membership sites Stripe confirms the payment, your system grants access, and renewals and lapses are handled without anyone stepping in.

Why custom rather than a plugin

Payment plugins handle a standard checkout. They can't follow your subscription rules, split payments between parties or start your own workflows when a payment succeeds or fails. When your business model is specific, the payments need to match it. Read Stripe plugin vs custom integration to see where the line falls, and how Stripe webhooks work.

What's included

  • Stripe keys stored securely on the server
  • Webhooks for every event you need, with signatures checked
  • Products, prices and Radar rules set up in your account
  • Testing in Stripe's test mode, including failures, renewals and refunds
  • A handover document, and the code is yours

Not included: your Stripe account and verification, Stripe's transaction fees, and changes to your platform outside the integration.

Payment is 50% to start and the balance on completion. For what drives the price, read what a Stripe integration costs. Comparing providers? See GoCardless vs Stripe and PayPal vs Stripe.

Try it

The Stripe webhook demo lets you trigger real Stripe events, such as a successful payment, a declined card or a refund, and watch them being handled.

How it's built

  • The price is set on the server The customer's browser never decides what they pay. Amounts come from your own product catalogue on the server, so nobody can edit a request and pay £1 for a £100 product.
  • Webhooks do the real work A payment isn't treated as complete because the customer landed on a thank-you page. It's complete when Stripe sends a signed event saying so. Every event is checked to be genuinely from Stripe, recorded so a repeat delivery is never processed twice, and handled in a way that copes with events arriving out of order.
  • Strong Customer Authentication handled UK and EU cards often need a 3D Secure check from the customer's bank. The integration handles the extra step properly, including off-session renewals where the bank asks the customer to confirm.
  • Subscriptions tested over time Renewals, failed payments, retries, upgrades part-way through a month and cancellations are tested by moving Stripe's test clock forward, so you see a whole year of billing play out before a real customer pays.
  • Customers can manage themselves Card changes, invoices and cancellations can go through Stripe's hosted customer portal, so you're not doing it by hand.

Built from experience

I've built Stripe into my own platforms, not just client projects. TradingPit uses Stripe billing with subscription tiers enforced through webhooks. The Repair Works takes card payments for repair bookings, with prices checked on the server against the live catalogue. ReGraded, my trade-in platform, runs its subscription billing on Stripe, with upgrades, downgrades, cancellations and the customer portal.

How to get a price

Send a short written spec by WhatsApp, text, email or the form: how you take payment, what should happen after it, and your platform. I'll reply within 24 hours with a quote.

Guides

Questions

Do I need a Stripe account?

Yes, a verified Stripe account in your business's name. For Connect, your platform account and your sellers' accounts are set up separately, and I'll advise on the structure.

What is Stripe Connect?

It lets a platform take payments on behalf of other businesses and split the money between them and you. Marketplaces and booking platforms use it.

Can Stripe handle complicated subscriptions?

Yes. Custom billing cycles, usage-based pricing, trials and proration are all possible. They just need building properly.

What happens when a payment fails?

Stripe's Smart Retries try again automatically. The integration adds notifications, a grace period and suspending access to suit your business.

How long does a build take?

One-time payments take 1–2 weeks, subscriptions 2–3 weeks and Connect marketplaces 3–4 weeks, starting once your Stripe account is verified and the deposit is paid.

Need this built into your system?

Quicker to message? WhatsApp or text 07398 946 380, or email paul@paul-walsh.co.uk.

Your details are only used to reply to you.