What is payment gateway & PSP integration?
Payment gateway integration connects your checkout, app or platform to payment service providers so customers can pay by card, wallet or bank transfer. NNT Software integrates Stripe, Adyen, Checkout.com, PayPal and regional rails such as Pix, UPI, SEPA Instant and FedNow, with multi-PSP routing, payouts, 3DS2 and automated reconciliation.
Every failed payment is lost revenue. Merchants expanding into new countries need local payment methods, smart routing between providers and clean reconciliation — not just a single checkout button.
We design payment architecture that is PCI-DSS aware from the start: tokenisation, hosted fields and minimal card-data exposure, so your compliance scope stays small.
Key benefits of payment gateway & PSP integration
Higher approval rates
Smart routing sends each payment to the provider most likely to approve it.
Local payment methods
Customers pay the way they prefer in each country.
Resilience
Automatic failover keeps checkout running during provider outages.
Lower fees
Routing by cost and negotiated rates reduces processing spend.
Clean reconciliation
Settlements matched automatically to orders and accounts.
Our payment gateway & PSP integration capabilities
Multi-PSP orchestration
Route by cost, currency and approval rate with automatic failover.
Local payment methods
Pix, UPI, iDEAL, BLIK, Bizum, mada, KNET, M-Pesa and more.
Marketplace payouts
Split payments, escrow, vendor onboarding and scheduled payouts.
Subscriptions & invoicing
Recurring billing, dunning and proration.
3DS2 & fraud rules
Strong customer authentication with risk-based exemptions.
Reconciliation
Settlement matching, fees and chargeback tracking in one ledger.
Outcomes clients typically see: higher approval rates, faster market expansion and clean finance reconciliation.
Common use cases
E-commerce checkout
Cards, wallets and local methods for online stores.
SaaS billing
Subscriptions, invoicing and dunning.
Marketplace payouts
Split payments and seller settlements.
Payment facilitators
Merchant onboarding and sub-merchant management.
Technology stack
We choose technology for long-term maintainability, performance and the skills available to your team. Typical payment gateway & PSP integration stack:
- Stripe — developer-friendly payment platform for cards, wallets and subscriptions
- Adyen — enterprise payment platform with global acquiring
- Checkout.com
- PayPal
- Node.js — fast, event-driven JavaScript runtime for APIs and real-time features
- PostgreSQL — reliable open-source relational database with strong JSON and extension support
How much does payment gateway & PSP integration cost?
The final cost of payment gateway & PSP integration depends on five main factors: the number of user roles and screens, the integrations required (payments, identity, ERP, CRM, messaging), compliance and security requirements, the seniority mix of the team, and the engagement model.
We always start with a short discovery phase so the estimate you receive is fixed and written, not a vague range. Ongoing maintenance and hosting typically add 15–20% of the build cost per year.
| Scope | Typical timeline |
|---|---|
| Single PSP integration | 2–4 weeks |
| Multi-PSP orchestration | 2–4 months |
| Marketplace payments | 6–12 weeks |
| White-label gateway | 4–8 months |
How we deliver payment gateway & PSP integration projects
Every payment gateway & PSP integration engagement follows the same disciplined, transparent process. You always know what is being built, what it costs and what comes next.
1. Discovery and scoping (1–2 weeks)
Workshops with your stakeholders to understand goals, users, workflows and constraints. We document requirements as user stories, map integrations and agree success metrics, then share a written scope, milestone plan and fixed estimate for payment gateway & PSP integration.
2. UX and architecture (1–3 weeks)
Designers produce user flows and a clickable prototype while architects choose the stack, hosting, data model and security controls. Nothing is built until you sign off the prototype and architecture.
3. Agile development (two-week sprints)
Developers build in short sprints with a demo at the end of each one. You see working software early, give feedback continuously and can reprioritise the backlog at any time.
4. Quality assurance
Dedicated QA engineers write test cases, run manual and automated regression tests, check performance and review security basics before every release. Defects are tracked openly.
5. Launch
We deploy with zero-downtime pipelines, migrate data if needed, monitor closely during the first days and train your team or users.
6. Support and growth
After launch, SLA-backed support covers bug fixes, monitoring, security patches and continuous improvement, so the product keeps improving as your business grows.
Engagement models and pricing options
You can engage NNT Software for payment gateway & PSP integration in whichever way fits your budget, risk appetite and internal team.
| Model | Best for | How billing works |
|---|---|---|
| Fixed price | Clearly defined scope and deadline | Agreed price split into milestone payments |
| Dedicated team | Long-term products and evolving roadmaps | Monthly fee per engineer, scale up or down |
| Time & materials | Exploratory or fast-changing work | Hourly or daily rates against actual effort |
| Hybrid | Fixed MVP followed by ongoing growth | Fixed first phase, then monthly team |
Whichever model you choose, you own the source code and intellectual property, work directly with the engineers, and receive weekly progress reports and demos.
Security, quality and compliance standards
Security and quality are built into every payment gateway & PSP integration project from the first sprint, not added before launch.
- Secure coding aligned with the OWASP Top 10 and peer code reviews on every change
- Encryption in transit (TLS) and at rest, secrets stored in managed vaults
- Role-based access control, multi-factor authentication and audit logs
- Automated tests in CI pipelines, plus manual exploratory and regression testing
- Data-protection by design for GDPR, CCPA, PDPL, DPDP and similar laws
- Infrastructure as code, monitoring, alerting and tested backups
- NDA before discovery and full IP assignment in the contract
Common payment gateway & PSP integration mistakes to avoid
- Handling raw card data and inflating PCI-DSS scope.
- Relying on one PSP for every market.
- Ignoring local payment preferences.
- Manual reconciliation of settlements.
- Weak handling of chargebacks and refunds.
Payment Gateway & PSP Integration trends for 2026
- Account-to-account and instant payments replacing cards in many markets.
- Network tokenisation improving approval rates.
- Stablecoin settlement for cross-border flows.
- Embedded finance inside software platforms.
How to choose a payment gateway & PSP integration partner
Use this checklist when comparing vendors:
- Has integrated your target PSPs
- Minimises PCI scope
- Supports local methods
- Builds reconciliation
- Handles 3DS2 and SCA
- Monitors payment success rates
Why companies outsource to NNT Software in India
India is the world's largest software-services hub, and NNT Software combines that talent depth with a product mindset. For payment gateway & PSP integration, clients typically save 40–60% compared with agencies in the United States, United Kingdom, the Gulf or Australia, without compromising on quality or communication.
Our engineers work in English, overlap daily with your business hours and follow documented processes. You get a named project manager, direct access to developers, and the stability of a company that has delivered more than 2,000 projects since 2010 and runs eight of its own SaaS products.
Payment Gateway & PSP Integration for clients worldwide
We deliver Payment Gateway & PSP Integration for businesses in 95 countries across North America, South America, Europe, Gulf & Middle East, Asia Pacific and Africa. Overlapping working hours, local payment and compliance knowledge, and remote-first collaboration make distance irrelevant.
- North America: United States, Canada, Mexico, Panama, Costa Rica, Dominican Republic, Guatemala, Puerto Rico, Jamaica, Trinidad and Tobago, The Bahamas
- South America: Brazil, Argentina, Colombia, Chile, Peru, Uruguay, Ecuador, Paraguay
- Europe: United Kingdom, Ireland, Germany, France, Netherlands, Belgium, Luxembourg, Spain, Portugal, Italy, Switzerland, Austria, Sweden, Norway, Denmark, Finland, Poland, Czech Republic, Romania, Greece, Malta, Cyprus, Estonia, Lithuania, Hungary, Croatia, Bulgaria, Serbia, Slovakia, Slovenia, Latvia, Iceland, Georgia, Armenia
- Gulf & Middle East: United Arab Emirates, Saudi Arabia, Qatar, Kuwait, Bahrain, Oman, Türkiye, Jordan
- Asia Pacific: Australia, New Zealand, India, Singapore, Malaysia, Indonesia, Thailand, Vietnam, Philippines, South Korea, Sri Lanka, Bangladesh, Kazakhstan, Uzbekistan, Azerbaijan, Nepal, Cambodia, Fiji
- Africa: South Africa, Nigeria, Kenya, Egypt, Morocco, Ghana, Rwanda, Mauritius, Tanzania, Uganda, Ethiopia, Côte d'Ivoire, Senegal, Tunisia, Botswana, Zambia
Select a country from the market list on this page for regulation, payments and delivery details specific to that market.
Next steps
Ready to discuss payment gateway & PSP integration? Here is how to get started with NNT Software:
- Share your goals, users, must-have features and timeline through the contact form, email or WhatsApp.
- Join a free 30-minute discovery call with a solution architect — we sign an NDA first if you prefer.
- Receive a written proposal within 48 hours: scope, milestones, team, timeline and fixed estimate.
- Kick off with a discovery workshop and see working software in your first sprint demo.