What Is Online Payment Gateway Integration?
Payment gateway integration is how ecommerce businesses let customers pay digitally — smoothly, safely, and without friction. A well-built online payment gateway moves your customer’s personal and payment data between your app and the payment processing system in seconds, with zero compromise on security.
- Integration timelines run 2–5+ months, depending on the integration method and complexity.
- Cost ranges from $8,000 to $40,000, depending on integration complexity and gateway type.
- A full team is required: project manager, business analyst, solution architect, developers, DevOps, and QA — INNERLUXES brings them all.
Types of Payment Gateways
Not every payment gateway works the same way — and picking the wrong one can cost you customers, compliance headaches, and real money. INNERLUXES carefully weighs the benefits and limitations of each type for your specific business before recommending anything.
Hosted Payment Gateway
- Customer redirected to provider’s site to pay.
- Quick and straightforward to start accepting digital payments.
- No sensitive card data on your servers.
- Limited control over payment flow and checkout UX.
- Features capped by the provider’s offering.
Direct Post Gateway
- Customers never leave your checkout page.
- Sensitive data moves instantly to gateway server on submit.
- Smooth, uninterrupted native checkout experience.
- No sensitive data stored on your servers.
- Integration must be built to high security standards.
Self-Hosted White-Label
- Ready-built gateway plugs in via ready-to-use or custom APIs.
- Full checkout inside your app, under your brand.
- Full control over data processing and storage.
- PCI DSS compliance is entirely your responsibility.
- Connecting to legacy systems can get complex without planning.
Custom Payment Gateway
- Built to your exact spec via custom APIs.
- Any payment method, any recurring billing logic.
- Complete ownership of processing flow.
- No ongoing fees to a payment intermediary.
- Gateway itself can become a revenue stream.
Solutions That Integrate with a Payment Gateway
INNERLUXES delivers payment gateway integration for a wide range of solutions:
Integration Roadmap
The path to a working payment gateway integration depends on your business, your existing systems, and the scale of what you’re building. Here’s how INNERLUXES approaches it — step by step, with no surprises.
Step 1 — Analysis & Requirements
We dig into your business needs, map stakeholder requirements, identify regulatory risks including PCI DSS, and document exactly which systems need to connect and what data flows between them. Duration: 1–3 weeks.
Step 2 — Project Planning
We define project deliverables, duration, budget, critical milestones, KPIs, risks and mitigation strategies, plus expected TCO and ROI of the integration solution. Duration: 1–2 weeks.
Step 3 — Integration Design
We select the best-fitting gateway type, assist in choosing a market-available provider based on your priorities, design the architecture and feature set, and optionally design a custom checkout UI. Duration: 2–5 weeks.
Step 4 — Tech Stack Selection
We define all technologies needed to connect your gateway with your corporate solutions and external processors, compare options against your documented requirements, and select the optimal stack with clear justification. Duration: 2–3 weeks.
Step 5 — Implementation & Testing
We develop all custom integration code, APIs, redirect scripts, and payment buttons. Functional, performance, integration, and security testing — nothing goes live until it passes. Duration: 2–8+ weeks.
Step 6 — Support & Evolution
Continuous monitoring of your live integration, horizontal and vertical scaling as transaction volume grows, and new functionality added as your business evolves. You shouldn’t have to rebuild every time your needs change. Duration: continuous.
Aisha
Payments Solutions Consultant
at INNERLUXES
“For payment gateway integrations, we enforce rigorous security testing at every stage — not just at go-live. That means API authorization audits, DDoS simulation, intrusion detection checks, and end-to-end PCI DSS validation before a single transaction goes live in production.
Selected Projects by InnerLuxes
Costs of Payment Gateway Integration
Every project is different — your cost depends on the chosen integration method, setup fees for a gateway and merchant account, the number and complexity of functional modules in a custom gateway, and the extent of modifications needed in your existing systems.
Here are the key cost factors and rough starting points to give you a sense of what to expect.
Hosted or direct post gateway integration with a market-available provider for a standard ecommerce app.
Self-hosted white-label gateway integration with custom checkout UI design and full PCI DSS compliance setup.
End-to-end custom payment gateway development with proprietary processing logic and multi-system integration.
Why Choose INNERLUXES for Payment Gateway Integration
Software integration solutions across complex, high-stakes environments. Here’s what that means for you in practice.
Security built in from day one
Every integration INNERLUXES builds is protected with API authorization controls, DDoS protection, firewalls, intrusion detection, and data loss prevention — because one security gap in a payment system is one too many.
Prompt project kick-off
We can start your project within one to two weeks of engagement. Lean, Agile, and DevOps practices baked into how we work mean we move fast without disrupting your ongoing business operations.
Effort & cost optimization
We help you choose the right gateway type and integration pattern for your budget and goals — not the most expensive option. Where proven frameworks can speed things up without compromising quality, we use them.
Consistent collaboration
You’re never left guessing what’s happening with your project. INNERLUXES works closely with your stakeholders throughout — so the integration we build reflects how your business actually operates.
Deep cross-industry expertise
Serving 30+ industries including ecommerce, BFSI, healthcare, IT, telecoms, and professional services — we’ve seen the specific payment requirements and edge cases your industry throws up.
Quality-first delivery
Quality-first delivery backed by a mature, structured quality management process. Robust security management embedded into how we build — not just what we document.
Technologies We Use for Payment Gateway Integration
Our 132 professionals work with a broad, proven set of technologies to build payment gateway integrations that are fast, secure, and built to last.
Front-end programming languages
HTML5
CSS3
JavaScript
Angular
React
Meteor
Vue.js
Next.js
EmberBack-end programming languages
.NET
Java
Python
Node.js
PHP
GoMobile
iOS
Android
Xamarin
Cordova
PWA
React Native
Flutter
IonicDatabases / Data Storages
SQL Server
MySQL
Oracle
PostgreSQL
Azure SQL
MS Fabric
MongoDBCloud Databases, Warehouses & Storage
Amazon S3
Redshift
DynamoDB
DocumentDB
Amazon RDS
ElastiCache
Data Lake
Blob Storage
Cosmos DB
Synapse Analytics
Cloud SQL
Cloud DatastoreDevOps
Docker
Kubernetes
OpenShift
Mesos
AWS Dev Tools
Azure DevOps
Jenkins
TeamCity
Zabbix
Nagios
Elasticsearch
Prometheus
Grafana
DatadogChoose Your Service Option
Integration consulting
You need a clear integration path before writing a single line of code. We analyze your business needs, select the right gateway type, design the architecture, and deliver a full integration roadmap with risk mitigation plan.
I’m Interested →Full integration implementation
Hand the entire project to a team of 132 professionals who have delivered 68 integrations across 30+ industries. We analyze, design, build, test, and go live — you own every line of code.
I’m Interested →Team augmentation
Your in-house team needs experienced payment integration specialists to fill skill gaps fast. We embed the right people quickly — keeping your costs balanced and your timeline on track.
I’m Interested →Payment Gateway Integration – Q&A
Typically 2–5 months depending on the integration method. Hosted gateways are fastest to integrate. Custom gateway development can take significantly longer due to the build complexity. INNERLUXES provides a detailed timeline after requirements analysis.
Yes. INNERLUXES’s compliance specialists guide you through obtaining and maintaining PCI DSS compliance at every stage of the project — from design through to go-live and beyond. Compliance is built into the process, not patched on at the end.
INNERLUXES integrates with all major market-available payment gateways — including PayPal, Stripe, and financial institution processors — as well as custom-built proprietary gateways. We run a detailed side-by-side comparison of providers so you get the features you need without overpaying.