Stripe, PayPal, Subscription Billing & Custom Checkout
Payment Gateway Integration — Accept Payments Seamlessly
We integrate payment gateways into your web application, mobile app, or SaaS platform. From one-time payments and subscription billing to marketplace payouts and multi-currency support, we build secure, PCI-compliant payment flows that maximize conversion and minimize failed transactions.
ZTABS Payment Gateway Integration: We integrate payment gateways into your web application, mobile app, or SaaS platform. From one-time payments and subscr 300+ clients, 500+ projects. Houston, TX.
Payment Gateway Integration: Payment gateway integration runs $5K–$10K for basic Stripe/PayPal checkout, $10K–$25K for subscription billing, and $15K–$35K for marketplace payouts via Stripe Connect. Stripe 2.9% + $0.30; PayPal 3.49% + $0.49.
ZTABS provides payment gateway integration — We integrate payment gateways into your web application, mobile app, or SaaS platform. From one-time payments and subscription billing to marketplace payouts and multi-currency support, we build secure, PCI-compliant payment flows that maximize conversion and minimize failed transactions. Our capabilities include stripe integration, subscription management, multi-payment methods, and more.
Integrated 150+ Stripe, PayPal, Adyen, and Square deployments — every integration ships with subscription dunning logic, failed-payment retry schedules, and a documented PCI-scope diagram so compliance audits aren't a panic.
How We Approach Payment Gateway Integration
Payment integration is more than dropping in a Stripe widget. We build complete payment architectures — checkout flows optimized for conversion, subscription management with dunning and proration, marketplace payouts with connected accounts, invoicing, tax calculation, and revenue recognition. Whether you're launching a new SaaS, adding subscriptions to your platform, or building a marketplace with split payments, we deliver secure, reliable payment infrastructure.
Common Use Cases for Payment Gateway Integration
- Integrate Stripe Checkout and Stripe Elements for web payments
- Build subscription billing with trials, upgrades, and dunning
- Set up marketplace payouts with Stripe Connect
- Integrate PayPal, Apple Pay, Google Pay alongside credit cards
- Build custom checkout flows with address validation and tax calculation
- Implement webhook handlers for payment lifecycle events
- Add metered usage billing for API-based SaaS products
- Build invoicing and revenue recognition systems
What Our Payment Gateway Integration Includes
Core capabilities we deliver as part of our payment gateway integration.
Stripe Integration
Full Stripe integration — Checkout, Elements, Payment Intents, Subscriptions, Connect, Invoicing, and Billing Portal. We handle the complexity so you get a seamless payment experience.
Subscription Management
Recurring billing with free trials, proration, plan changes, cancellation flows, dunning for failed payments, and usage-based metering.
Multi-Payment Methods
Accept credit cards, debit cards, ACH, Apple Pay, Google Pay, PayPal, bank transfers, and regional payment methods — all through a unified integration.
Marketplace Payouts
Split payments between your platform and sellers using Stripe Connect. Handle onboarding, identity verification, payout schedules, and tax reporting.
PCI Compliance
Our integrations use tokenization and Stripe Elements to minimize your PCI scope. No sensitive card data touches your servers.
Webhook Processing
Reliable webhook handlers for all payment events — succeeded, failed, refunded, disputed. Idempotent processing ensures no duplicate charges or missed events.
Technologies We Use for Payment Gateway Integration
Our team picks the right tools for each project — not trends.
Stripe
Stripe powers payments for millions of businesses. Accept cards, digital wallets, and local methods. Manage subscriptions, invoicing, and revenue recognition. Developer-first APIs and webhooks for full control.
Unified Payments API
Subscriptions
Stripe Billing
Developer Experience
Compliance
Node.js
Node.js empowers businesses to build scalable applications with unparalleled speed and efficiency. By leveraging its non-blocking architecture, organizations can deliver seamless user experiences and accelerate time-to-market, driving innovation and growth.
Scalable Performance
Faster Time-To-Market
Cost Efficiency
Enhanced User Experience
Robust Ecosystem
Cross-Platform Compatibility
Next.js
Next.js transforms web applications into high-performance, SEO-friendly platforms that drive user engagement and boost conversion rates. Leverage its capabilities to streamline your development process and accelerate time-to-market, ensuring your business stays ahead of the competition.
Blazing Fast Performance
SEO Optimization
Server-Side Rendering
Scalable Architecture
Enhanced Security Features
Rich Ecosystem and Community Support
TypeScript
TypeScript is a typed superset of JavaScript that adds static type checking and enhanced tooling. Catch errors at compile time, improve code maintainability, and accelerate development with world-class IDE support.
Static Type Checking
Enhanced IDE Support
Better Code Documentation
Improved Maintainability
Gradual Adoption
React
Harness the power of React to accelerate your development process, enhance user experiences, and drive ROI. With its component-based architecture, React allows businesses to build dynamic applications that are both scalable and maintainable, ensuring long-term success in a competitive landscape.
Rapid Development
Scalability
Enhanced User Experience
Cost Efficiency
Strong Community Support
SEO Optimization
From Discovery to Launch
Our Payment Gateway Integration Process
Every payment gateway integration project follows a proven delivery process with clear milestones.
Payment Architecture
Design the payment flow — one-time vs recurring, pricing model, tax requirements, supported payment methods, and payout structure.
Integration Development
Build the payment integration with proper error handling, webhook processing, and frontend checkout components.
Testing & Security
Comprehensive testing with Stripe test mode — edge cases, failed payments, refunds, disputes, subscription changes, and webhook reliability.
Launch & Monitor
Go live with monitoring for failed payments, webhook errors, and revenue metrics. Provide ongoing support for pricing changes and new payment methods.
Why Choose ZTABS for Payment Gateway Integration?
What sets us apart for payment gateway integration.
Stripe Certified Experts
We've integrated Stripe into dozens of SaaS platforms, marketplaces, and e-commerce stores. We know every API, edge case, and best practice.
Conversion-Optimized
Checkout flows designed for maximum conversion — minimal friction, smart defaults, saved payment methods, and one-click payments.
Subscription Specialists
We handle the complexity of recurring billing — proration, plan changes, trials, dunning, metered billing, and revenue recognition.
Secure by Default
PCI-compliant architectures that minimize your security scope. Tokenization, server-side validation, and idempotent webhook processing.
Ready to Get Started with Payment Gateway Integration?
Projects typically start from $10,000 for MVPs and range to $250,000+ for enterprise platforms. Every engagement begins with a free consultation to scope your requirements and provide a detailed estimate.
When ZTABS Isn't the Right Fit
- • Budget under $10K: Our minimum engagement is $10,000. For smaller projects, consider freelance platforms or no-code tools.
- • Template-only sites: If you need a basic WordPress or Squarespace site with no custom logic, a specialized web designer will be faster and cheaper.
- • Ongoing staff replacement: We build and hand off — we are not a body shop. If you need permanent employees, consider a recruiting firm.
What We've Learned From 500+ Projects
Across our portfolio, we track delivery patterns to improve outcomes. Our internal data from 2023-2026 shows:
- • Projects with a dedicated discovery phase (2+ weeks) have 40% fewer change requests during development.
- • Teams using our sprint-based delivery model ship first working features within 2-3 weeks of kickoff.
- • Clients who stay for post-launch optimization see an average 30% improvement in core metrics (load time, conversion, or cost reduction) within 90 days.
- • 90% of our clients continue working with us beyond the initial engagement — the highest retention signal in our business.
How ZTABS Payment Gateway Integration Compares to Alternatives
| Alternative | Best For | Cost Signal | Biggest Gotcha |
|---|---|---|---|
| Stripe (Checkout, Elements, or Connect) | Modern SaaS, marketplaces, subscriptions, any developer-led team shipping in TypeScript/Node. | 2.9% + $0.30 per US card; 0.8% for ACH Direct Debit (capped at $5); Connect adds ~$1.50 + 0.75% per debit card payout. | Stripe Tax and Radar (fraud) are billed separately and surprise teams on their first statement — plan for ~0.5% on top of processing fees. |
| PayPal + Braintree | Consumer e-commerce where PayPal wallet drives measurable uplift; teams with existing Braintree merchant accounts. | 3.49% + $0.49 for PayPal wallet; 2.99% + $0.49 for standard card payments; Braintree is near-Stripe parity. | Buyer-favored dispute resolution — sellers lose ~60%+ of PayPal chargebacks even with documentation. Build a reserves buffer into cashflow forecasts. |
| Adyen | Multi-region enterprise (GMV >$5M/year) that wants one contract across US, EU, APAC with higher auth rates on premium card BINs. | Interchange++ model: ~0.60% + $0.13 base fee + interchange + scheme fees; effective ~1.2%–1.8% for mature merchants. | Implementation is 6–12 weeks with a dedicated Adyen onboarding manager. Not worth it below ~$3M/year GMV — Stripe's simplicity wins at lower volume. |
| Square | Retail, restaurants, and hybrid online + in-person where the same provider handles POS hardware and online checkout. | 2.6% + 15¢ in-person (Free plan); 3.3% + 30¢ online (Free) or 2.9% + 30¢ (Plus); hardware from $59. | API is less developer-friendly than Stripe — SDK maturity, webhook ergonomics, and docs all lag. Pure-online SaaS teams regret picking Square for checkout. |
| Shopify Payments / platform-native | Stores already on Shopify (waives the 2% third-party transaction fee); WooCommerce + WooPayments similar. | 2.9% + $0.30 on Basic → 2.4% + $0.30 on Advanced. Using a third-party gateway adds an extra 0.6%–2% platform fee by plan tier. | Locked to the hosting platform — if you migrate off Shopify, you lose Shopify Payments and must re-underwrite with another processor, often causing a 1–2 week payout freeze. |
When Agency Delivery Pays Off for Payment Gateway Integration
**Stripe vs. Adyen crossover.** Stripe effective rate is ~2.9% + $0.30/txn. Adyen at Interchange++ for a mature card-present merchant lands at ~1.5% all-in (savings of ~1.4% of GMV). Adyen's integration, compliance review, and ongoing account management cost ~$40K–$80K in year one. Crossover at $80K implementation / 1.4% savings = **~$5.7M annual GMV** before Adyen beats Stripe on total cost. Below that, stay on Stripe. **Subscription billing: Stripe Billing vs. custom.** Stripe Billing + Tax costs ~0.5–0.7% of revenue on top of processing (effective ~3.4%+). A custom subscription engine takes 4–8 engineer-weeks ($20K–$60K) and has ongoing edge-case maintenance (proration, mid-cycle upgrades, dunning, failed-payment retry logic). Rule: below **~$2M ARR**, use Stripe Billing — the recurring surcharge is cheaper than the engineering. Above $2M ARR, evaluate a hybrid (Stripe for payments, custom for billing logic). **Marketplaces: Stripe Connect Express vs. Custom.** Stripe Connect Express (hosted onboarding) costs ~$1.50 + 0.75% per debit card payout (or $1.50 per local bank transfer); Custom Connect is free on payouts but you own KYC/AML ($30K–$80K compliance build + ongoing Persona/Alloy fees ~$1–$2/verification). Crossover: at **~$400K monthly payout volume**, Custom Connect saves more than it costs in compliance tooling.
Real-World Gotchas We Have Hit on Payment Gateway Integration Projects
Stripe Radar false-positive nukes new-customer conversion
A client saw 'unusual fraud' in week 2 of launch — Radar was blocking 18% of first-time checkouts. Root cause: the site had no billing address field, so most cards scored as high-risk. Adding billing address + 3D Secure 2 challenge (instead of block) dropped false-positives to 2% and recovered ~16% of revenue overnight. Always ship with 3DS as a fallback, not an outright block.
Webhook idempotency failure double-charges customers
Stripe retries webhook events up to 3 days. A team that processed `payment_intent.succeeded` without checking for a prior success for the same event ID ended up fulfilling an order twice and running a second $499 subscription charge. Always key order fulfillment and side-effects on `event.id` (or `payment_intent.id`) in an idempotency table.
Subscription proration math disputes
Stripe's default proration credits the unused portion of the old plan and debits the new plan. A customer upgrading mid-month from $29 to $99 plans sees a $70 charge they didn't expect, then disputes. Solutions: either disable proration (`proration_behavior: 'none'`), bill the full difference on the next cycle, or put a preview-invoice UI in front of the upgrade so customers see the exact charge before confirming.
PCI DSS self-assessment surprise at 1M transactions
Using Stripe Elements keeps you in SAQ A (the simplest PCI form). As soon as you customize the card form with raw iframe manipulation or proxy card data through your servers, you drop to SAQ D — hundreds of controls, annual audit, $5K–$40K/year in compliance cost. Teams that bypass Elements for design reasons discover this only when a merchant bank asks for their AOC.
Stripe Tax misses a jurisdiction at year-end
Stripe Tax calculates based on the customer's billing address at checkout, but if a customer updates their address mid-subscription, Stripe doesn't retroactively recalculate. One client discovered ~$14K in unremitted sales tax across 7 states at year-end audit. Fix: listen for `customer.updated` webhook and re-rate upcoming invoices when tax jurisdiction changes.
When Payment Gateway Integration From ZTABS Is the Wrong Fit
- ⚠You only need to accept one or two donations a month. Standing up a custom Stripe integration for <50 transactions/year is overkill. Use Stripe Payment Links, Buy Me a Coffee, or a Gumroad page — zero engineering, 5-minute setup. We'll tell you to skip hiring us.
- ⚠You sell a regulated product (cannabis, firearms, adult, gambling, CBD). Stripe, PayPal, Square all prohibit or restrict these categories. You need a specialized high-risk processor (Authorize.net, Paragon, Easy Pay Direct). Rates are 4%–8% + setup fees of $500–$2,500. We don't specialize here — we'll refer you to a firm that does.
- ⚠You need crypto-only checkout. Crypto payment integrations (Coinbase Commerce, BitPay, NOWPayments) have different reconciliation, webhook, and chargeback models than card processors. We can build it, but the 'gotchas' library is different — if 100% of your checkout is crypto, hire a Web3-first shop.
- ⚠You want us to maintain PCI DSS SAQ D compliance for you. If your architecture requires card data to pass through your servers (Level 1 PCI), you need a dedicated security partner, quarterly ASV scans, and annual audits. We build compliant architectures but do not take on ongoing PCI attestation duty — that's a specialist role.
Frequently Asked Questions About Payment Gateway Integration
Find answers to common questions about our payment gateway integration.
Stripe is our default recommendation for most businesses — best developer experience, broadest feature set, and excellent documentation. We also integrate PayPal, Square, Braintree, and Adyen based on specific requirements like regional coverage or pricing.
Explore More Services
AI Development
We build production-grade AI systems — from machine learning models and LLM integrations to autonomous agents and intelligent automation. 23 AI-powered products shipped, 300+ clients served.
Web Development Services
We build modern web applications using Next.js, React, and Node.js — from marketing sites and dashboards to full-stack SaaS platforms. Every project ships with responsive design, SEO optimization, and performance scores above 90 on Core Web Vitals.
Mobile Apps
We build native iOS, Android, and cross-platform mobile apps using Swift, Kotlin, React Native, and Flutter. From consumer apps with social features to enterprise tools with offline sync — we deliver polished, high-performance applications from concept to App Store and Play Store.
SaaS Development
End-to-end SaaS development from MVP to scale — multi-tenancy, Stripe billing, role-based access, and cloud-native architecture. We have built and shipped 23 SaaS products of our own, serving 50,000+ users. Next.js, Node.js, PostgreSQL, AWS and Vercel.
Need Payment Gateway Integration Talent?
Payment Gateway Integration by Location
Payment Gateway Integration by Industry
HealthcareFintechReal EstateEducationLogisticsRetailFashionFood & BeverageTravelLegalInsuranceConstructionAutomotiveManufacturingNon-ProfitE-commerce & DTC BrandsSaaS CompaniesMarketing AgenciesCoaches & ConsultantsFitness & WellnessMedia & EntertainmentAgriculture & AgTechEnergy & UtilitiesGovernment & Public SectorRecruitment & HR TechCrypto & Web3Dental & VeterinaryRestaurants & HospitalitySports & GamingAccounting & CPA FirmsStartups & Early-StageFreelancers & SolopreneursMarketplace PlatformsSubscription & MembershipChurches & Religious OrganizationsBeauty & Personal CareWarehousing & FulfillmentEvents & TicketingStaffing & Temp Agencies
Ready to Start Your
Payment Gateway Integration Project?
Get a free consultation and project estimate for your payment gateway integration project. No commitment required.
500+
Projects Delivered
4.9/5
Client Rating
90%
Repeat Clients