Use shared secrets, asymmetric signatures, timestamps, and nonces to block tampering and replays. Reject stale messages, store minimal context, and log verification results. During a red-team exercise, defenders traced forged calls within seconds and tightened supplier keys accordingly.
Throttle calls to respectful levels, prefer idempotent endpoints, and build retries with capped backoff. Monitor 429s and timeouts for upstream distress. These simple habits preserve goodwill, protect rate allocations, and stop runaway loops that make dashboards suddenly unreadable.
Validate inputs against strict schemas, strip risky HTML, and escape special characters. Allow only expected fields, lengths, and encodings. After adopting schema checks, a media company stopped mysterious failures and uncovered a partner silently sending malformed, privacy-harming payloads.
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