Payment Integration That Works First Time
You need payment gateway integration that works on day one, not six weeks of debugging after launch. Whether you want to integrate a payment gateway into your existing platform, hire a payment gateway integration company to handle a new build, or bring in payment gateway developers to fix a checkout that keeps dropping transactions, the question is always the same: who can actually deliver this without breaking everything else? We handle end-to-end payment gateway development, from gateway selection and architecture through to PCI-compliant deployment and ongoing monitoring. That means custom payment integration for web and mobile apps, full payment gateway integration for e-commerce platforms, and the ability to set up payment processing across Stripe, PayPal, Adyen, Braintree, and dozens of other providers. Ready for a payment integration quote? Tell us what you are building.
Payment gateway integration typically costs between $5,000 and $100,000 depending on the number of gateways, complexity of the checkout flow, subscription billing requirements, and PCI compliance scope. A single-gateway integration takes 2 to 6 weeks. Multi-gateway setups with payment orchestration take longer.
Core Capabilities and Features
Subscription Billing and Recurring Payments
If your product charges monthly or annually, payment gateway integration gets more complex. Recurring billing is not just "charge them again next month." It involves dunning management (handling failed renewals), proration when customers upgrade or downgrade, trial period logic, coupon and discount handling, invoice generation, and tax calculation across jurisdictions. Stripe Billing and Braintree handle most of this natively. Others require custom logic on your side.
- Dunning management, proration, trial periods, coupons, invoice generation, and tax calculation handled
- Stripe Billing and Braintree used natively where possible, custom logic built where needed
- Billing state machine designed right from day one to avoid patching while customers are actively paying
Webhook Handling and Failure Recovery
Webhooks are how the gateway tells your system what happened: payment succeeded, payment failed, dispute opened, subscription renewed. What happens when your server is down when a webhook fires? What if the webhook arrives before your database has finished writing the order? What if the gateway sends the same event twice? Every one of these scenarios causes real problems if not handled.
- Idempotency keys, ordered event processing, retry backoff, and dead-letter queues for failed deliveries
- Webhook monitoring dashboard so you can see delivery success rates in real time
- Every scenario covered: server downtime, out-of-order events, and duplicate gateway notifications
Multi-Currency and Cross-Border Payments
Selling internationally means more than just adding a currency selector to your checkout page. You need to handle currency conversion rates (and who absorbs the spread), settlement currencies (which currency your account actually receives), local payment methods (iDEAL in the Netherlands, Bancontact in Belgium, PIX in Brazil), and regulatory requirements that differ by country.
- Currency conversion, settlement currencies, and local payment methods configured per market
- Adyen and Stripe Connect for native multi-currency with local settlement to reduce conversion losses
- iDEAL, Bancontact, PIX, Alipay, Apple Pay, and Google Pay supported based on your geographic mix
Why It Matters
If you are launching an e-commerce store, a SaaS product, or a marketplace, your payment flow is the one part of your product that directly touches revenue. Every other feature is negotiable. This one is not. A checkout that fails on mobile loses the sale and the customer. A payment flow that does not handle 3D Secure correctly gets blocked in Europe. A subscription system that double-charges users on renewal destroys trust overnight. And a gateway integration that is not PCI compliant puts you one breach away from fines that can reach six figures per month. The founders and product teams that get the best results are the ones who treat payment integration as a first-class engineering problem, not a "just plug in Stripe" afterthought. The ones who struggle are the ones who copy a tutorial, ship to production, and then spend three months firefighting edge cases.
By the Numbers
$4.5B
Global payment gateway market size projected for 2026, growing at 12.8% CAGR. Demand for professional integration services is growing faster than ever.
Source: Fortune Business Insights, 2025
70.2%
Average shopping cart abandonment rate in 2025. Payment friction, limited payment methods, and unexpected costs at checkout are among the top five reasons. A well-integrated gateway directly reduces this number.
Source: Baymard Institute, 2025
13%
Of shoppers abandon carts specifically because their preferred payment method is not available. Supporting wallets, BNPL, and local methods closes this gap.
Source: Cropink Cart Abandonment Report, 2025
$5.9M
Average cost of a data breach in the financial sector in 2024. Proper PCI scope reduction through correct integration architecture is the single best way to lower this risk.
Source: IBM Cost of a Data Breach Report, 2024
$5K-$100K/mo
range of PCI DSS non-compliance penalties that escalate monthly if not resolved
Source: PCI Security Standards Council / Clone Systems, 2025
"The most expensive payment integration is the one you have to rebuild. Every shortcut during setup, every edge case you skip, every compliance requirement you defer turns into a production incident that costs ten times more to fix under pressure than it would have cost to get right the first time."
Technologies
Our Tech Stack
Our Process
How we turn ideas into reality.
Project Brief
You fill in the short project brief form (takes 5 minutes).
Checkout Review
Your current checkout flow is reviewed and initial recommendations come back within 24 hours.
Alignment Call
A 30-minute call is scheduled to align on gateway selection, timeline, and budget.
Written Proposal
You receive a written proposal with fixed-price options.
Pricing
Investment Overview
Number of Gateways
A single-gateway integration with hosted checkout is a focused 2 to 4 week project. Multi-gateway setups with payment orchestration, routing logic, and fallback require significantly more architecture and testing.
Subscription Billing Requirements
One-time payments are straightforward. Recurring billing adds dunning management, proration, trial periods, coupon handling, invoice generation, and tax calculation across jurisdictions.
PCI Compliance Scope
Hosted checkout reduces PCI scope to SAQ A (13 questions). Direct API integration requires full PCI DSS Level 1 compliance with quarterly scans, annual penetration testing, and audit costs that can run $50,000 to $150,000 per year.
Everything we do at Techneth is built around making data move reliably between the systems that matter. If you want to understand our approach before committing, you can read more about our team and how we work. Or explore the full range of digital product and development services we offer, like payment gateway integration. And if you already know what you need, get in touch directly and we will find time to talk.
Frequently Asked Questions
Everything you need to know about this service.
- How long does payment gateway integration take?
- A single gateway integration with hosted checkout typically takes 2 to 4 weeks for a standard e-commerce setup. Direct API integration with custom checkout takes 4 to 8 weeks. Multi-gateway setups with subscription billing, multi-currency, and payment orchestration take 8 to 16 weeks. The timeline depends on your existing architecture, not just the gateway documentation.
- What is the difference between hosted checkout and direct API integration?
- Hosted checkout (Stripe Checkout, PayPal buttons) handles card data entirely on the gateway side, reducing your PCI scope to a simple self-assessment. Direct API integration means card data passes through your servers, requiring full PCI DSS Level 1 compliance. Most businesses should start with hosted checkout unless they have a specific reason to handle card data directly.
- Can you integrate multiple payment gateways into one checkout?
- Yes. Payment orchestration lets you route transactions through different gateways based on currency, region, card type, or transaction value. This improves approval rates, reduces costs, and provides a fallback if one gateway has downtime. An abstraction layer is built so your application code does not need to know which gateway is processing each transaction.
- Do I need PCI DSS compliance for payment integration?
- If you accept card payments, PCI DSS applies to you in some form. The scope depends on your integration method. Hosted checkout requires only SAQ A (13 questions). Direct API requires full PCI DSS Level 1 with quarterly scans and annual audits. Integrations are architected to minimise PCI scope by default, which reduces both cost and ongoing compliance overhead.
- How do you handle failed payments and retries?
- Smart retry logic distinguishes between hard declines (stolen card, closed account) and soft declines (insufficient funds, temporary hold). Soft declines are retried on an exponential backoff schedule. All retries use idempotency keys to prevent duplicate charges. For subscriptions, dunning sequences notify customers before and after a failed renewal.
- What payment methods should we support beyond credit cards?
- At minimum, support digital wallets (Apple Pay, Google Pay) as they reduce checkout friction significantly. If you sell internationally, add local methods (iDEAL, Bancontact, PIX, Alipay) relevant to your markets. BNPL options (Klarna, Afterpay) increase conversion for higher-value purchases. The choice depends on your customer demographics and geographic mix.
Ready to get a quote on your payment gateway integration?
Tell us what you are building and we will put together a scoped proposal within 3 business days. Here is what happens when you reach out:
- 1You fill in the short project brief form (takes 5 minutes).
- 2We review it and come back with initial thoughts within 24 hours.
- 3We schedule a 30 minute call to align on scope, timeline, and budget.
- 4You receive a written proposal with fixed price options.
No commitment required until you are ready. Request your free payment gateway integration quote now.
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