The 6-Step Payment Gateway Integration Lifecycle
Integrating payment infrastructure requires absolute reliability. Here is the exact, human-built development process we follow to take your raw bank documentation to live, revenue-clearing transactions.
How We Deliver Your Integration
From raw bank documentation and sandbox testing to staging release. You check the live connection on your side, payment clears, work done.
Documentation & Sandbox Ingestion
Client shares bank credentials and API specifications
You share your bank or payment gateway API documentation (PDF, portal link, or Swagger/Postman) along with sandbox/test keys (Merchant ID, API passwords, test certificates, and IP whitelist requirements).
- Receipt of test Merchant ID & Gateway endpoints
- Review of API specification (REST, SOAP, or ISO 8583)
- Server IP whitelisting with the bank network
- Mutual Non-Disclosure Agreement (NDA) signed upfront
Platform & Security Scope Audit
Technical analysis of your CMS, custom stack, or mobile app
We evaluate your target platform—WordPress / WooCommerce custom plugin, Magento, PrestaShop, or custom Next.js/Laravel app where full code access is available. We determine the optimal integration pattern (Hosted Checkout vs. Drop-in iframe vs. Direct S2S) to keep your business strictly in PCI-DSS SAQ-A scope.
- CMS version hooks & headless compatibility verification
- Decision on checkout UX: embedded fields vs hosted redirect
- PCI-DSS SAQ-A scope verification (zero card data on server)
- Resilient webhook listener & state machine design
Custom Integration Plan & Fixed Quote
Clear milestone timeline, deliverables, and fixed pricing
We provide a transparent development roadmap with defined delivery checkpoints. You receive a guaranteed fixed-price quote with zero hidden hourly billing, detailing exact test cases and delivery schedules.
- Detailed scope of work and edge-case coverage
- Fixed milestone delivery schedule (typically 3 - 5 business days)
- Specification of supported payment methods (Cards, Apple Pay, 3DS2)
- Clear deliverables: source code, installation guide, admin settings
Development & Webhook Implementation
Writing clean, modular, PSR / ES-compliant code
Our senior payment developers build the custom module or API service directly in your staging environment or a private git branch. We build robust error handling, cryptographic signature verification (HMAC-SHA256), and replay-proof webhook consumers.
- Native integration into store checkout flow or mobile SDK
- Tokenization & 3D Secure 2.x frictionless/challenge handling
- Idempotent webhook callbacks with replay prevention
- Comprehensive transaction audit logging in admin panel
Rigorous Sandbox QA & Edge-Case Testing
Validating every transaction status before live rollout
We execute a complete battery of bank-specified test scenarios using test cards to verify all operational pathways: successful authorizations, 3DS OTP challenges, insufficient funds, expired cards, network timeouts, and refund handling.
- Test card executions: Visa, Mastercard, and regional debit rails
- Verification of 3DS OTP verification and challenge fallback
- Testing webhook event processing during network latency
- Customer order status transitions (Pending -> Paid -> Shipped)
- Completion of bank-required UAT certification questionnaire
Release & Client Live Connection Check
We deploy to production, client verifies live connection & payment, work done
Once sandbox verification is completed, we configure the production environment and release the integration. You (the client) test a real live card payment on your side to confirm end-to-end clearing into your merchant bank account. Once live connection is verified and payment is done, work is done!
- Production credentials configured & debug logs restricted
- Staging / Production release delivered to client
- Client verifies live connection and tests live payment on their side
- Payment confirmed, work done, full source code handover & warranty
Zero Raw Card Data On Your Servers (PCI-DSS SAQ A)
All integrations are developed using bank-approved Hosted Fields, Tokenized Sessions, or Secure Redirection. Your web server never touches, transmits, or stores sensitive cardholder data.
PCI-DSS SAQ-A Scope Architecture
Why our integrations keep your server completely out of PCI compliance scope.
Hosted Fields & iFrames
Card numbers, expiration dates, and CVVs are captured in cryptographically isolated iframes hosted directly on the bank or processor\'s infrastructure.
Single-Use Tokens
Your server only ever receives a short-lived opaque payment token. If compromised, this token is completely useless to an attacker outside your merchant account.
HMAC Webhook Signatures
Every payment notification callback from the bank is cryptographically validated using shared secret hashes (HMAC-SHA256) to prevent spoofing or replay attacks.