Payment Gateway Integration for Websites, Apps and Marketplaces
A payment gateway is the service that securely passes a customer's payment details from your website or app to the bank or card network and returns the result. Integrating one correctly means more than adding a Pay button.
Alive Inc. integrates licensed payment gateways into websites, mobile apps and marketplaces. We do not hold customer funds or provide financial licences; the payment provider does that.
The full picture includes what happens when a payment succeeds, fails, is disputed or refunded, and how your orders and accounts stay in step with the provider.
What we build
Capabilities
What Payment Gateway Integration Involves
Integration connects your checkout, order system and accounting to a payment provider through its API, so payments are collected, confirmed and recorded automatically.
A complete integration typically includes:
- Checkout that collects payment details securely
- Payment authorization and capture
- Confirmation of success or failure to your order system
- Webhooks so the provider can notify you of later events
- Refunds and partial refunds
- Records for reconciliation and reporting
The Payment Lifecycle Your Integration Must Handle
Most integration problems appear outside the happy path. We design for every stage.
Initiate
- Create a payment or order reference and send the customer to a secure payment step.
Authorize and capture
- Confirm funds are available, then collect them at the right moment, such as at order or dispatch.
Confirm
- Verify the result server-side and update the order, not just the browser screen.
Handle failure
- Explain declines clearly, allow retry and avoid duplicate orders.
Refund and dispute
- Support full and partial refunds and record chargebacks or disputes.
Reconcile
- Match provider settlements to orders and invoices.
Choosing a Payment Provider
The best provider depends on your customers, countries and business model, not just on fees.
Questions worth answering:
We help compare options against these questions and integrate the one that fits.
- Which countries and currencies must you accept?
- Which payment methods do your customers use?
- Do you need recurring billing or marketplace payouts?
- How is the provider licensed and supported in your region?
- What are the fees, settlement times and dispute processes?
- How good are the API, documentation and sandbox?
Payment Methods We Integrate
Availability depends on the provider and region.
Common methods include:
- Debit and credit cards
- Digital wallets
- Bank transfers and direct debit
- Local and regional payment methods
- Buy-now-pay-later where offered by the provider
- Payment links and invoices
Webhooks and Reliable Order Updates
Customers close browsers and networks fail, so the browser is not a reliable place to learn a payment result. Providers send server-to-server webhooks for that.
A reliable setup includes:
- Verified webhook signatures
- Idempotent handling so duplicates do not double-process
- Retry-safe processing and logging
- Handling of late, out-of-order or missing events
- Alerts when webhooks fail
Security and Card Data
The safest approach is to keep raw card data off your servers.
Good practice includes:
Compliance obligations depend on your integration method and the provider; we explain what applies to your setup.
- Using the provider's hosted fields or hosted payment page
- Never storing full card numbers or security codes
- Secure handling of API keys and secrets
- Encrypted connections everywhere
- Logging without sensitive data
Explore
Recurring Payments and Subscriptions
Charging customers repeatedly needs stored payment credentials handled through the provider, plus logic for renewals and failures.
Recurring setups cover:
- Saved payment methods via the provider
- Renewal schedules and receipts
- Retry logic for failed charges
- Customer updates to payment details
See
Marketplace and Split Payments
Multi-vendor platforms need to divide payments between sellers and the platform.
Typical needs:
Available options depend on the provider and local rules, which we confirm early.
- Commission calculation per order or category
- Seller balances and payout schedules
- Refunds that adjust seller balances
- Provider features that support marketplace flows
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Multi-Currency and International Sales
Selling across borders adds currency, tax and payment-method differences.
Considerations:
- Displaying and charging in local currencies where supported
- Currency conversion and settlement currency
- Regional payment methods
- Tax and invoicing rules confirmed with your advisor
Testing Before You Go Live
Payments deserve thorough testing in the provider's sandbox.
We test:
- Successful, declined and cancelled payments
- Refunds and partial refunds
- Webhook delivery, duplicates and delays
- Mobile and different browsers
- Reconciliation against test settlements
Connecting Payments to Orders, Accounting and CRM
A payment should update the rest of the business automatically.
Common connections:
- Order status and inventory
- Invoices and accounting entries
- Customer records and receipts
- Notifications to customers and staff
See also
How we deliver
How a Payment Integration Project Runs
Requirements
We confirm countries, currencies, methods, refund rules and recurring or marketplace needs.
Provider selection
We compare providers against those needs and confirm what is supported.
Design the flow
Checkout, order states, webhooks, failure and refund handling are designed.
Build and integrate
The integration is built against the provider's API and your systems.
Test in sandbox
We test success, failure, refund and webhook scenarios thoroughly.
Go live and monitor
We switch to live credentials, verify real transactions and monitor for problems.
Why Alive Inc
Why Choose Alive Inc. for Payment Integration?
Whole lifecycle, not just checkout
Webhooks, refunds, failures and reconciliation are part of the build.
Security-conscious
Card data stays with the provider; secrets and logs are handled carefully.
Provider-neutral advice
We help you compare and integrate the option that fits your market.
Connected to your systems
Payments update orders, accounting and notifications automatically.
Support after launch
We monitor, maintain and adjust integrations as providers change.
Questions
Frequently asked
What is a payment gateway?
A payment gateway is the service that securely transmits payment details from your website or app to the bank or card network and returns the result.
Do you hold customer funds?
No. We integrate licensed payment gateways. The provider handles the funds and holds the financial licences.
Which payment gateway should I choose?
It depends on your countries, currencies, payment methods, recurring or marketplace needs, fees and support. We help compare options against your requirements.
Why are webhooks important?
Customers may close the browser or lose connection after paying. Webhooks let the provider confirm the result to your server so orders update reliably.
Is it safe to take card payments on my website?
Yes, when card data is handled by the provider through hosted fields or pages and never stored on your servers. Compliance depends on the method used.
Can you set up recurring payments?
Yes. Saved payment methods, renewals, retries and receipts can be integrated through the provider.
Can you support a marketplace with split payments?
Where the provider supports it, commissions, seller balances and payouts can be built into the flow.
How do you test payments before launch?
In the provider's sandbox, covering success, declines, refunds, webhooks and reconciliation, then with a controlled live transaction.
Keep exploring
Related pages
Take Payments Reliably
Get a Quote
Tell us where you sell, in which currencies and how you want to charge. We will recommend a provider approach and integrate it end to end, including refunds and reconciliation.