APIs & Middleware
QiCard & Custom Payment Gateway Middleware Hub
- PHP
- MySQL
- REST/JSON APIs
- cURL
- Webhooks
Before
Client required seamless local sandbox-to-production integration for QiCard payment flows, instant refund webhooks, and order status callbacks.
After
Engineered a secure PHP API middleware handling transaction initiation, signature verification, instant refund webhooks, and automated reconciliation logs.
Problem statement
Client required seamless local sandbox-to-production integration for QiCard payment flows, instant refund webhooks, and order status callbacks.
Solution built
Engineered a secure PHP API middleware handling transaction initiation, signature verification, instant refund webhooks, and automated reconciliation logs.
Tech architecture
- Gateway
- QiCard sandbox and live payment API calls.
- Verify
- HMAC signature checks on callback handlers.
- Ledger
- Refund, cancellation, and reconciliation logs in MySQL.
Results
-
HMAC
Signed callbacks
-
Refunds
Instant webhook flow
-
Logs
Reconciliation trail
Screenshots
Callbacks
Paid, refund, and cancel events in one log.
If this is the kind of system you need
Book a call and bring the workflow as it works today. We will say what should be built, and what should be left alone.