Payment Gateway Integration Services

Customers always look for safe and quick payments. Fulminous Software sets up your payment gateway so customers can pay the way they like, and so your team stops chasing missing orders and matching payments by hand. Whether you take ten orders a day or ten thousand, the setup keeps working, and we are still around after launch when something needs fixing. Our payment gateway integration services cover:

• Stripe integration
• PayPal and Braintree integration
• Razorpay, PayU, Cashfree and CCAvenue integration
• Authorize.Net integration
• Adyen and Checkout.com integration
• Square integration
• Worldpay, Amazon Pay, Payoneer and Skrill integration
• Apple Pay and Google Pay setup
• UPI, net banking and wallet integration
• Buy now, pay later options such as Klarna and Afterpay

No two businesses collect money the same way. A subscription app needs recurring billing and smart retries. A marketplace needs split payments and seller payouts. A travel site needs multi-currency support and refunds that don’t take three weeks. We don’t push a one-size-fits-all plugin. We look at how your money moves and build the integration to match. Contact us!

There is more than one way to connect a gateway, and the right choice depends on your platform, your design needs and your compliance burden.

The cheapest gateway on paper is not always the cheapest in practice. When Fulminous Software helps clients choose, we compare:

• Transaction fees, monthly fees, setup fees and chargeback fees
• Supported countries, currencies and local payment methods
• Support for cards, digital wallets, UPI, bank transfers and BNPL
• Recurring billing and subscription tools
• Fraud prevention features
• Compliance support (PCI DSS, PSD2, GDPR, RBI rules)
• Checkout customization options
• Quality of documentation and developer tools
• Merchant account requirements and approval time
• Settlement speed and payout options

Not sure which gateway fits? Tell us your markets, average order value and monthly volume. Fulminous Software will tell you what makes sense, even if that means a cheaper option than the one you had in mind.

A payment gateway is more than a button on a checkout page. Done properly, it affects your conversion rate, your support workload and your legal exposure.

Payment data is the most sensitive thing your website touches. Our approach to secure payment gateway integration includes:

• PCI DSS aligned architecture, so card details never sit on your own server
• Tokenization and end-to-end encryption
• 3D Secure 2 and strong customer authentication (SCA) for PSD2 markets
• Secure server-side payment verification, so a payment is never trusted just because the browser says it succeeded
• Fraud detection rules and risk scoring
• Webhook signature verification
• Secure API key and secret management
• Role-based access control and two-factor authentication on payment dashboards
• Firewalls, intrusion detection and vulnerability scanning
• Security audits and sandbox testing before launch

If you operate in the UK, EU, India or the US, we also consider local regulations such as PSD2, RBI guidelines and GDPR while planning the build.

Relying on one gateway is risky. If it goes down or declines a legitimate card, you lose the sale. Many growing businesses connect two or more gateways so payments keep flowing.

Our multiple payment gateway integration work includes:

• Smart routing, so each transaction goes to the gateway most likely to approve it
• Automatic failover when a gateway is slow or unavailable
• Different gateways for different countries or currencies
• One unified admin dashboard and one reporting format
• Lower processing fees by routing based on card type or region

Your customers see a single, simple checkout while you get the flexibility of several providers.

Most businesses are better off using an established provider. But some have good reasons to build their own: very high transaction volumes, unusual billing rules, a need to control processing costs, or a plan to offer payments as a product to other companies. Fulminous Software builds:

• Custom and self-hosted payment gateways
• White-label payment gateways
• Custom billing workflows and recurring payment journeys
• Custom payment plans, instalments and deposits
• Tailored multi-gateway setups
• Payment processing infrastructure and admin tools

Building your own gateway means taking on more compliance work, more security responsibility and a longer timeline. Fulminous Software will lay out those trade-offs honestly before you commit, and if a third-party gateway does the job, we will say so.

A working integration is more than an API key. Behind a normal checkout, Fulminous Software puts together:

• API connections to the payment provider
• Server-side payment handling
• Webhooks and callback handling for payment status updates
• Checkout design and payment forms
• Multi-currency configuration
• Subscription and invoice payment features
• Fraud protection layers
• Backend dashboards for your team
• Custom workflows that match your business rules

Our custom payment gateway integration services also connect payments to your ERP, CRM and accounting software, so sales data flows into the tools your team already uses.

• eCommerce stores, shopping carts and online marketplaces
• Mobile app in-app payments
• Subscription and SaaS billing
• Invoicing, billing and accounting software
• Customer portals
• Booking and reservation systems
• Point-of-sale systems
• Order management systems
• Donation and crowdfunding platforms
• Wallets and peer-to-peer payment features
• Food delivery and on-demand apps
• Education and course platforms
• Healthcare and appointment payments
• B2B payment portals

Payment gateway integration fits almost any business that takes money online. The setup changes with how you sell, so here is how it works for the most common models.

Getting paid is only half the job. Once the integration is live, someone has to keep it running. Fulminous Software helps with:

• Refund, failure and retry workflows
• Handling gateway errors and failed responses clearly
• Webhook and status automation, so orders update without manual work
• Admin dashboards for payment management
• Reporting that your finance team can use for reconciliation
• Email and SMS notifications for payments and failures
• Monitoring and alerts when payment success rates drop
• Security updates and compliance checks
• Updates when a gateway changes its API

Plenty of developers can paste in a plugin. Fewer understand what happens when a payment fails halfway. Before you hire anyone, ask about:

• Experience with the specific gateway you want to use
• How they handle security and PCI compliance
• Whether they test failed and duplicate payments
• Experience with subscriptions, refunds and webhooks
• Whether they support multiple gateways
• Clear pricing and a defined scope
• Post-launch support
• Samples of past work or client references

If a company can’t answer these plainly, keep looking.