Mobile App Payment Gateway Integration Services

No two apps earn money in the same way. A ride-hailing app needs pre-authorization and split payouts. A SaaS app needs recurring billing. A marketplace needs escrow and seller settlements. Fulminous Software has shipped 15+ mobile app payment gateway integration projects, and we shape each build around your revenue model instead of dropping in a generic checkout. Our team is strong in:

• Stripe Integration
• Razorpay Integration
• PayPal and Braintree Integration
• Adyen and Checkout.com Integration
• Square Integration
• Google Pay and UPI Integration
• Subscription and Recurring Billing
• Tokenization and Saved Cards
• 3-D Secure and SCA Setup
• Webhook, Refund and Dispute Automation
• Wallet and Payout Systems

Tell us what you sell and who buys it, and we will map out the right payment gateway integration setup. Contact us now!

Any app that takes money should let people pay inside it. Some kinds of apps feel the benefit sooner than others:

If you are weighing up payment gateway integration in mobile application work for one of these, Fulminous Software will tell you plainly what you need and what you can skip.

A good checkout in mobile apps does more than move money. Here is what changes when experienced engineers handle payment gateway integration mobile app work for you.

Mobile app payment gateway integration providers are not all equal. Before you commit to one, check that it covers the following:

Here is the full range of mobile app payment gateway integration work our team takes on:

A lower rate per transaction can still cost you more overall if the checkout converts badly, so look at the whole picture. We go through these points with every client:

The exact steps shift slightly between providers, but the path looks like this:

• Open a merchant or developer account with the provider and complete business verification.
• Read the API and SDK documentation, then settle on a pattern.
• Collect your keys from the developer dashboard. Secret keys stay on the server and never go into the app.
• Build the checkout screen: payment buttons, card fields or a wallet sheet.
• On your backend, create a payment intent or order for the exact amount.
• Let the app confirm the payment through the SDK and handle any 3-D Secure challenge.
• Listen for webhooks to learn the final result, then update the order.
• Handle declines, timeouts, duplicate taps and refunds.
• Test with sandbox cards, then run quality assurance on real Android and iOS devices.
• Switch to live keys, release in stages and watch the first transactions closely.

Payments are the wrong place to learn on the job. A general app studio may build a lovely checkout screen and still miss the pieces that protect your money. A team that has shipped payment gateway integration in mobile application projects before will ask about refunds, chargebacks and edge cases on the first call. Look for:

• Hands-on experience with your chosen gateway
• Knowledge of PCI DSS and strong customer authentication
• Native Android and iOS skills
• Flutter and React Native experience
• Backend and webhook expertise
• Experience with subscriptions and marketplaces
• Careful handling of failed and duplicate payments
• A solid testing and sandbox process
• Clear pricing and honest timelines
• Post-launch monitoring and support
• Store policy awareness for Apple and Google
• Readable documentation at handover

Money and personal data call for care. Our mobile payment gateway integration process follows these safeguards from day one:

• PCI DSS Alignment
• Card Tokenization
• End-to-End Encryption
• 3-D Secure 2 and SCA
• Secure Key and Secret Storage
• Certificate Pinning
• Root and Jailbreak Detection
• Webhook Signature Verification
• Idempotent Payment Requests
• Fraud and Risk Rules
• Audit Logs and Activity Tracking
• Data Privacy and Consent Controls
• Vulnerability and Penetration Checks

Beyond the app itself, we look at the layers around it. Know-your-customer and anti-money-laundering checks matter for wallets and payouts. Firewalls, DDoS protection and rate limits guard your API, and strict authorisation rules keep sensitive records from leaking. Every payment result is confirmed on the server rather than taken on trust from the phone.

The build is a one-time cost. The charges below keep running, and they depend on your provider, so ask for them in writing. When you plan a payment gateway integration mobile app budget, add these to the development quote:

• Setup fees, which some providers charge and many do not
• Fixed monthly fees or licence fees
• Per-transaction fees, usually a percentage plus a small fixed amount
• Refund fees
• Chargeback and dispute fees
• Currency conversion and international card surcharges
• PCI compliance fees, if your provider or bank passes them on
• Merchant account fees, where the account is separate from the gateway

Building your own gateway from scratch costs far more upfront, with licensing, certification and audits to pay for. It rarely makes sense until your volumes are very large.

A payment gateway integration in mobile application setup has five moving parts, and each has one clear job:

Before writing code we also agree on the non-functional needs: response times, expected load, uptime targets and how data is encrypted and logged. The cloud setup is sized to match, and Fulminous Software finishes with documentation your own team can follow without calling us.