APIs connect applications, payments, email, logistics and business data. They also extend the security boundary. A reliable integration assumes that networks fail, requests can be repeated and credentials may be targeted.
Keep credentials on the server
Never place private API keys in browser JavaScript, mobile bundles or public repositories. Use protected configuration or environment variables, restrict keys by capability and IP where supported, and rotate exposed credentials.
Validate every input and response
Check types, lengths and allowed values on the server. Treat third-party responses as untrusted data. Use timeouts and predictable error handling so a slow provider does not exhaust application resources.
Verify webhooks and repeated events
Validate signatures before processing a webhook. Store provider event identifiers and make handlers idempotent so retries do not create duplicate orders, payments or messages.
Limit information in logs
Record correlation identifiers, HTTP status and operational context without logging tokens, passwords or unnecessary personal information. Protect log files from public access and define a retention period.
Monitor the business outcome
A technically successful request may still produce an incorrect order state or missing email. Monitor end-to-end results. KG WebTech Services applies these controls to PHP, Laravel, Node.js, Python and Flutter integrations.
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