Custom Checkout Flows & API Payments

You don’t need a store to sell online

Not every business that accepts payments needs a full e-commerce platform. If you sell consulting hours, coaching sessions, online courses, event tickets, memberships, or a small number of digital products, platforms like Shopify or WooCommerce add complexity and monthly costs that don’t match what you actually need.

What you need is a way for someone to visit your website, understand your offer, and pay you, without leaving the page, without creating an account, and without navigating a shopping cart designed for retail.

That is what a custom checkout flow does. We take your existing website (whether it is a Launch page, a Presence site, or even a Platform with multiple departments) and we add the ability to accept payments directly. No store. No cart. No catalogue to manage. Just a clean, branded payment experience that sends money to your account and triggers whatever automation needs to happen next.

How it works in practice

The experience your customer sees is simple. They click a button (“Book Now”. “Buy Course”. “Reserve Ticket”. “Start Project”) and a payment form appears. It can be a modal, an embedded form, or a redirect to a hosted checkout page, depending on what feels right for your brand and your flow.

Behind that button, we build a direct integration with your payment processor. We work primarily with Stripe for international card payments, and with Easypay, MB WAY, and Multibanco for the Portuguese market. If you already use another gateway with a public API, we can integrate that too.

Once the payment is confirmed, the system can automatically:

• send a confirmation email to the customer
• deliver a download link or access credentials for digital products
• add the customer to your CRM or email marketing platform
• create a calendar booking for a consultation
• trigger a webhook that starts your internal fulfilment workflow
• generate an invoice via your billing platform

All of this happens without you lifting a finger after the initial setup. The checkout is the front door; the automation is the engine behind it.

When this is the right choice

Custom checkout flows work best for businesses that sell a defined set of offers, not thousands of SKUs. If you recognise yourself in any of these scenarios, this is probably what you need:

Consultants and freelancers who sell packages, retainers, or hourly sessions and want clients to pay before the first meeting. Instead of sending invoices and chasing payments, the website becomes the point of sale.

Course creators and educators who sell digital courses, workshops, or training programmes. The checkout delivers access instantly after payment, no manual email, no waiting.

Event organisers who sell tickets to conferences, workshops, retreats, or private events. A checkout flow with limited inventory and automatic confirmation replaces the need for a ticketing platform.

Service businesses that want to accept deposits, pre-payments, or full payment for defined packages, cleaning services, legal consultations, photography sessions, design audits.

Membership and subscription models where recurring billing is set up once and runs monthly via Stripe subscriptions, without the overhead of a membership plugin or SaaS platform.

If your catalogue is small but your average transaction value is high, a custom checkout is almost always more profitable than a full e-commerce setup. You avoid monthly platform fees, your site stays fast, and the buying experience feels intentional rather than generic.

What makes this different from our e-commerce service

Our e-commerce service is designed for businesses that sell physical or digital products at scale, with catalogues, inventory management, shipping logic, tax rules, and complex product variants. That is a different kind of project, with a different architecture and a different budget.

A custom checkout is lighter. It lives on top of your existing website. It does not require a product database, a shopping cart, or a catalogue management system. It is built for businesses where the offer is clear, the number of products is small, and the goal is to remove friction between interest and payment.

Think of it this way: if your website is the salesperson, the custom checkout is the card machine in their hand. It does one thing (take the payment) and it does it well.

The technical architecture

We build checkout flows that are fast, secure, and maintainable:

• Payment processing, Stripe Checkout, Stripe Payment Links, or Stripe Elements for fully embedded forms. For Portugal, Easypay with MB WAY and Multibanco reference generation.
• Frontend, The checkout UI is built into your existing Astro or Next.js site. No iframes, no third-party page redirects (unless you prefer a hosted checkout for simplicity).
• Webhooks and automation, Payment confirmations trigger server-side events via n8n, Stripe webhooks, or direct API calls to your CRM, email platform, or fulfilment system.
• Security, Card data never touches your server. All sensitive payment data is handled by PCI-DSS Level 1 compliant processors. Your site remains a static, secure frontend.
• Hosting, Deployed via Cloudflare Pages or Vercel for global speed and reliability.

Pricing

Custom checkout integration starts from €900 for a single payment provider connected to your existing website with basic automation. This includes the checkout UI, payment gateway setup, confirmation emails, and one webhook integration.

For businesses that need multiple payment methods, subscription billing, multi-step flows, or complex post-payment automation, pricing is scoped per project. A typical checkout project with two payment providers and CRM integration runs between €1,500 and €2,500.

If you don’t have a website yet, we recommend starting with a Launch page (from €4,500) and adding the checkout flow as part of the same project, it is more cost-effective than building them separately.

Ready to start selling from your website?

If you have a service, a product, or an event that people want to pay for, and you want to remove every unnecessary step between their interest and your revenue, get in touch. We will scope the right checkout flow for your business and have it live within days, not months.