Services Payment gateway integration & billing

Payment gateway integration & billing

Payment Gateway Integration Services for Web, Mobile & SaaS Products.

Q: Can you set up both one-time and recurring subscription payments?

Yes. We design payment flows for one-time charges, subscriptions, memberships and retainers. This includes trials, coupons, plan upgrades and downgrades, renewals and cancellations, wired into your product logic and internal reporting.

Q: How long does payment gateway integration usually take?

Simple one-time payment integrations for a single gateway and basic checkout can sometimes be done in a couple of weeks. More complex setups – multiple gateways, subscriptions, marketplaces, payouts and accounting integrations – typically take longer. After a short discovery phase we provide a timeline based on your exact flows.

Q: Can you integrate multiple payment gateways into the same application?

Yes. Many products need more than one gateway – for example, Razorpay for Indian customers and Stripe or PayPal for international customers. We design a clean abstraction so your application can support multiple providers without duplicating logic everywhere.

Q: Do you handle PCI-DSS compliance for us?

We design integrations that keep sensitive card data with the payment gateway (for example, using hosted forms and tokenisation) and follow good security practices on your side: HTTPS, secure secrets management, role-based access and logging. Full PCI-DSS certification, if required, is usually a broader organisational responsibility, but we help you implement application-level patterns that support it.

Q: Can you migrate us from our existing payment gateway to another one?

Yes. We can analyse how your current gateway is used, review existing subscriptions and customers, then plan and execute a migration to Stripe, Razorpay, PayPal or another provider. Depending on the gateway, some data can be migrated directly while other parts may require phased transitions or dual running for a period.

Q: How do you handle failed payments, retries and dunning?

We wire gateway webhooks and events into your backend so you can track payment failures, expiry, disputes and other edge cases. Based on your policies, we can implement retries, notifications to customers, dunning emails and access control changes (for example pausing a subscription until payment is resolved).

Q: Can you support marketplaces, split payments and payouts to vendors?

Yes. Using features such as Stripe Connect or Razorpay Route, we can configure flows where customers pay once, the platform collects fees or commissions and the rest is routed to vendors or partners. We also connect payout and fee events to your internal ledgers for easier reconciliation.

Q: What do you need from us to start a payment gateway integration project?

We usually need clarity on your business model, target countries and currencies, types of products or services, how you want to charge (one-time, subscription, usage-based), any existing systems that must stay in sync, and which gateways you prefer or already use. If you are not sure, we can help you compare options and recommend a practical setup.

QalbIT helps you design and implement secure payment gateway integrations so customers can pay you smoothly from anywhere. We work with Stripe, Razorpay, PayPal, Coinbase Commerce and other gateways to support one-time payments, subscriptions, marketplaces, payouts and refunds – all wired cleanly into your product and finance processes.

Discuss your payment integration Share your billing requirements

Typically responding within 24–48 hours. Share your current product stage, tech stack and timelines.

Payment gateway integration overview

Payment gateway integration services for secure, reliable online payments

We help you accept online payments confidently by integrating leading payment gateways into your web, mobile and SaaS products. Instead of treating payments as an afterthought, we design flows that work for your users, finance team and long-term product roadmap.

When payment gateway integration with QalbIT makes sense

You are launching a new product or store and need to accept online payments from day one.
You want to move away from cash-on-delivery or manual bank transfers to card and UPI payments.
You are not satisfied with your current gateway and want to migrate to Stripe, Razorpay, PayPal or others.
You need subscriptions, trials, upgrades and renewals for a SaaS or membership product.
You run a marketplace or platform that needs split payments and payouts to vendors or partners.

Outcomes we usually target with payment integrations

Higher checkout conversion through clean, reliable payment flows.
Fewer failed or duplicated payments thanks to proper handling of webhooks and retries.
Clear mapping between payment events and your internal orders, invoices and ledgers.
Support for multiple payment methods, currencies and regions as you grow.
A payment integration that is easier to maintain and extend rather than a fragile script.

Before we write code, we map your payment flows: who pays whom, in which currency, using which methods and with what refund or dispute rules. This reduces surprises later.

What we implement

Payment gateway integration capabilities across one-time, subscription and marketplace flows

From simple one-time payments to complex marketplace and subscription billing, we design payment flows that match your business model and customer expectations.

One-time payments and checkout flows

One-time payments

Implement secure one-time payments for products, services, bookings or invoices using Stripe, Razorpay, PayPal or similar gateways.

Subscription and membership billing

Subscriptions

Set up recurring billing for SaaS, memberships or retainers with trials, coupons, upgrades, downgrades and renewals handled cleanly.

Marketplaces and split payments

Marketplaces

Design marketplace flows using features like Stripe Connect or Razorpay Route to route funds between your platform, vendors and partners.

Multi-currency and regional payments

Global payments

Configure currencies, local payment methods and tax/VAT logic so you can sell across regions while keeping reporting manageable.

Refunds, disputes and payouts

Operations

Wire refund, chargeback and payout events into your orders, wallets or accounting so finance teams are not reconciling manually.

Security, webhooks and compliance basics

Security

Implement secure payment flows, webhook handling, logging and access control aligned with gateway guidelines and good PCI-DSS practices.

Want to see how these capabilities map to your product? Share a quick overview and we will respond with a practical next step.

Discuss your payment gateway integration scope →

How payment projects work

A clear process for payment gateway integration and optimisation

We follow a structured, low-risk process so that payment gateway integration is tested properly, goes live smoothly and remains stable as your volumes grow.

01
Payment flows and gateway selection
1–2 weeks
Understand your business model, target geographies, currencies and user flows, then confirm which gateways and payment methods make the most sense.
Key outcome: Documented payment flows, chosen gateways and a clear list of events to handle.
02
Architecture and UX design
1–2 weeks
Design how the frontend, backend and gateways will interact, including checkout UX, tokens, webhooks, retries and mapping to orders or subscriptions.
Key outcome: Payment integration plan and UX flows aligned with product and finance needs.
03
Implementation and integration
2–6+ weeks (scope-dependent)
Implement the payment gateway integration in your backend and frontend, configure the dashboard and connect it with your existing systems.
Key outcome: Working integration in staging with test cards, flows and events verified.
04
Testing, go-live and monitoring
1–3 weeks
Run business and edge-case tests, help you go live and set up logging and monitoring for payment events, failures and anomalies.
Key outcome: Production-ready payment integration with essential alerts and dashboards.
05
Optimisation and ongoing support
Ongoing, month-to-month
Review conversion, failure reasons and gateway reports periodically, then make iterative improvements to flows, messaging and retry logic.
Key outcome: Better payment success rates and cleaner financial operations over time.

Want to see how this process applies to your current stage? Share a short brief and we will respond with a tailored next step.

Walk me through this process for my product →

Where this fits best

Payment gateway integration use cases we usually work on

Most of our payment gateway projects come from teams who want to stabilise or upgrade how they accept and manage payments across products and regions.

E-commerce and D2C stores

For E-commerce brands and marketplaces

E-commerce

Integrate Stripe, Razorpay, PayPal or local gateways into online stores for one-time orders, COD alternatives and partial payments.

Ask how this would work with your store stack →

SaaS and subscription products

For SaaS founders and product teams

SaaS billing

Set up recurring billing, trials, usage-based fees and upgrades/downgrades with clean mapping to your subscription model.

Discuss subscription billing for your SaaS →

Marketplaces and multi-vendor platforms

For Marketplaces and aggregators

Marketplaces

Implement split payments, commissions and payouts so your platform can charge customers once and route funds correctly to vendors.

Internal tools and invoicing portals

For B2B services and internal platforms

Internal tools

Connect your internal CRM or invoicing system to payment gateways so invoices can be paid online and reconciled automatically.

Not sure if your idea or system belongs here? Send us a short description and we will tell you honestly whether we are the right team for it.

Ask if your payment use case fits these patterns →

Gateways & tech stack

Payment gateways and technology stack we typically use

We integrate with leading global and regional gateways and wire them into backends, frontends and internal systems using robust, observable patterns.

Payment gateways and platforms

Core services that actually process payments and manage billing.

Stripe for global card payments, subscriptions and marketplaces.
Razorpay for India-focused payments, UPI and payouts.
PayPal for wallets and trusted consumer payments.
Coinbase Commerce and similar services for crypto payments where suitable.

Backend & APIs

How your application talks to payment gateways securely.

Laravel and NestJS backends using official or well-maintained gateway SDKs.
Webhook handlers for payment, subscription, refund and dispute events.
Queue workers and schedulers for retries, dunning and asynchronous tasks.

Frontend & UX

Checkout, payment pages and in-app billing experiences.

Next.js and other modern frontends integrated with hosted or embedded payment forms.
Secure tokenisation and client-side flows recommended by each gateway.
UX patterns for clear errors, status updates and retry options.

Security, monitoring & operations

Keeping payment flows safe, observable and maintainable.

HTTPS everywhere, secure secrets management and limited data storage.
Logging and dashboards for payment events, failures and anomalies.
Processes aligned with PCI-DSS best practices at the application level.

If you already have a preferred payment gateway, we will build around it. If not, we can recommend options based on your countries, currencies and business model.

FAQs · Custom software & teams

Frequently asked questions about payment gateway integration with QalbIT

These are the questions founders, finance teams and product owners usually ask when we discuss Stripe, Razorpay, PayPal and other payment gateway integrations.

✓ Covers custom software development, SaaS platforms, mobile apps and integrations.
✓ Answers about pricing, engagement models, NDAs, IP ownership and quality assurance.
✓ Written for founders, CTOs and product teams hiring a remote development partner.

Have a question that is not listed here?

Share your roadmap or idea and we’ll help you pick the right engagement model, tech stack and starting point.

Contact our experts

Which payment gateways can QalbIT integrate with?

We regularly work with Stripe, Razorpay, PayPal and Coinbase Commerce, and can integrate other gateways that provide reliable APIs and documentation. In many projects we use more than one gateway so you can support different regions, currencies or payment methods.

Can you set up both one-time and recurring subscription payments?

How long does payment gateway integration usually take?

Can you integrate multiple payment gateways into the same application?

Do you handle PCI-DSS compliance for us?

Can you migrate us from our existing payment gateway to another one?

How do you handle failed payments, retries and dunning?

Can you support marketplaces, split payments and payouts to vendors?

What do you need from us to start a payment gateway integration project?

Ready to accept payments reliably?

Let’s design a payment gateway integration that fits your product and markets.

Share your target countries, currencies, products and existing systems. We will propose a clear payment gateway integration plan that balances user experience, technical reliability and finance requirements.

Book a payment integration call Send your payment requirements

Typically we respond within 24–48 hours with next steps and suggested gateway options.