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© 2026 — Integration TrailsContent — CC BY-NC-SA | Code — MIT LicenseVER:2026-08-11-72a9b56
Challenges/generate-hmac-signature-for-secure-api-payload·DataWeave·ADVANCED
DataWeaveADVANCED

Generate HMAC Signature for Secure API Payload

This challenge involves creating a secure payload for an API call by generating an HMAC (Hash-based Message Authentication Code) signature. You will practice using cryptographic functions to build a signature from a canonical string representation of the data, a common requirement for ensuring message integrity and authenticity in system-to-system integrations.

#API Security#HMAC
BY @patryk_bandurski
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DWL
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%dw 2.0
output application/json
---
payload
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The fastest way
to learn integration.

01.
Production payloads
Real CSV/JSON/XML you'll meet on day one — null fields, mixed casing, partial records.
02.
Design problems
What practitioners actually solve — null-safety, idempotency, retries, batch boundaries.
03.
Edge cases that break
Empty arrays, type coercion, deeply nested transforms, locale-specific dates.
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CHALLENGES
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// WHAT YOU'LL BUILDHOW IT WORKS ↓
01.
Live DataWeave editor
Real DWL 2.0 IDE with helpers, modules, syntax highlighting.
02.
Test cases run on real runner
Same Go runner used in prod. Diffs show exactly which fields fail.
03.
3 graded attempts
Submit when you're ready. Score persists. Solution unlocks after pass or last attempt.
04.
Helpers & multi-module DWL
Bring in reusable %dw modules. Import, export, compose.
05.
XP & leaderboard
Points + XP awarded per challenge. Trail progress synced.
06.
Production-style payloads
Real CSV/JSON/XML — null fields, mixed casing, partial records.