Stripe, Razorpay, PayPal & Adyen · Webhooks & reconciliation · Split payments & payouts · PCI-aware
Payment Gateway Integration Services
Payment gateway integration for web and mobile apps: cards, UPI, wallets, bank transfers, subscriptions, split payments and payouts, with reliable webhooks and reconciliation.
Taking a payment is easy. Taking every payment exactly once, in every currency and method your customers use, and knowing where every rupee or dollar went, is the hard part.
Codersarts payment gateway integration connects your product to the right payment providers and builds the webhooks, ledgers and reconciliation that keep money movement accurate.
What Is Payment Gateway Integration?
Payment gateway integration connects an application to a payment provider so customers can pay by card, UPI, wallet or bank transfer. A complete integration creates payments on the server, shows a secure checkout, handles webhooks for payment status, supports refunds, disputes and payouts, and reconciles transactions against provider reports.
Who This Is For
SaaS and e-commerce products taking payments
Marketplaces paying sellers or service providers
Fintech startups building payment products
Businesses adding a second gateway or new markets
Apps with unreliable or duplicated payments
What We Integrate
Checkout
Hosted checkout or embedded payment forms. See Stripe integration.
Local payment methods
UPI, netbanking, wallets and local cards. See Razorpay integration.
Subscriptions
Plans, trials and upgrades. See subscription billing.
Split payments and payouts
Marketplace payouts with Stripe Connect, Razorpay Route or PayPal.
Multiple gateways
Routing by country, currency or method, with failover.
Webhooks
Verified, idempotent event handling. See webhook fixes.
Reconciliation
Daily matching of your records with provider settlements.
Choosing a Payment Gateway
Gateway | Strengths | Common use |
|---|---|---|
Stripe | Developer experience, global coverage, Connect and Billing | SaaS and global startups |
Razorpay | UPI, Indian methods and Route | Products selling in India |
PayPal and Braintree | Buyer trust and wallets | Consumer checkout |
Adyen and Checkout.com | Enterprise scale and global acquiring | High-volume businesses |
Common Payment Problems We Fix
Problem | Usual cause | Fix |
|---|---|---|
Customers charged twice | No idempotency | |
Orders unpaid after payment | Relying on redirects | |
Payouts don't match sales | No ledger | |
Checkout slow on mobile | Heavy scripts |
How Much Does Payment Gateway Integration Cost?
Cost depends on the number of gateways, payment methods and whether you need subscriptions, split payments or payouts.
Scope | Typical timeline | Typical cost |
|---|---|---|
Single gateway checkout | 1 to 3 days | $199 to $1,500 |
Subscriptions, refunds and reconciliation | 2 to 4 weeks | $4,000 to $12,000 |
Marketplace payouts or multiple gateways | 4 to 10 weeks | $12,000 to $40,000 |
What changes the cost: number of gateways and methods, currencies, subscriptions, split payments, payout rules, reconciliation and existing code quality.
Ranges are typical for a global team. Your price is fixed after scoping, before any work starts.
Ways to Start Small
Starting point | Best for | From |
|---|---|---|
A first payment flow | $199 | |
Fixing duplicated or missed payments | $29 | |
A ranked bug list for an existing platform | $199 | |
Ongoing fixes with a fixed budget | $290 for 10 hours |
How We Work
Map flows. Payments, refunds, payouts and fees.
Choose providers. Gateways by market, method and cost.
Build. Checkout, webhooks and ledger entries.
Reconcile. Daily matching with settlements.
Test. Test cards, failures, retries and refunds.
Go live. Live keys, monitoring and alerts.
What You Receive
Working payment flows
Verified, idempotent webhooks
Ledger entries and reconciliation
Test results for edge cases
Documentation and code ownership
Example Engagement: Adding India to a Global SaaS
An illustrative example based on the pattern we see most often. Client details are kept confidential.
The situation: A global SaaS on Stripe lost Indian customers who wanted to pay by UPI.
What we did:
Added Razorpay for Indian customers with routing by country
Kept one ledger across both gateways
Automated reconciliation for both providers
The result: Indian sign-ups grew, and finance kept a single view of revenue.
Mistakes to Avoid
Unlocking orders from the browser redirect
No idempotency on retries
No ledger, only provider dashboards
Skipping refunds and disputes in testing
Why Codersarts
Payments, security, cloud and AI engineers in one team
Money movement designed for correctness, not just the happy path
Fixed-price tasks for small jobs, so you can start without a large contract
Plain-language documentation for partner and bank reviews
You own all code, data and accounts
Frequently Asked Questions
Which payment gateway is best?
It depends on your markets and model: Stripe for global SaaS, Razorpay for India, Adyen for high-volume enterprises.
Can we use more than one gateway?
Yes, with routing rules and one internal ledger.
Do we need PCI DSS compliance?
Using hosted or tokenized checkout keeps your scope small, usually a self-assessment questionnaire.
How much does integration cost?
A single checkout starts at $199; marketplace payouts typically cost $12,000 to $40,000.
Related Pages
PCI DSS-compliant app development: card data security.
Digital wallet development: stored balances.
Fintech solutions: every fintech service in one place.
Take Every Payment Exactly Once
Tell us how money moves in your product, and we'll plan a reliable integration.