API Authentication Complete Notes

Published by SoftwareTestPilot

PDF • 22 pages • Notes • All Levels • API Testing

Published 8 September 2026 • Updated 28 September 2026

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API Authentication Complete Notes — notes for QA engineers, 22 pages.

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Overview

P i =i =, Two different checks. < S3 | AUTHENTICATION (AuthN) AUTHORIZATION (AuthZ) B Wy = Authentication verifies your identity. Authorization checks your permissions = You prove who you are using after you are authenticated. ] credentials (e.g., username/password, It decides what resources or actions g token, APl key). you are allowed to access. = — g Shows Shows what — who you are you can do —= Like showing a passport at the airport Like an access card at the offic

What you'll learn

Test identities, permissions, expiration, revocation.
Test missing, malformed, expired, stolen tokens.
Validate both identity and resource-level permissions.
Practice realistic API access-control scenarios.
Master auth flows: Keys, tokens, OAuth, JWT, sessions.
Test negative access: Roles, scopes, expiry, misuse.
Prove access is correctly controlled.

GO BEYOND THE TOKEN
ADDING AUTH HEADERS
Only checking valid credentials?
Authentication and authorization mixed up?
Need stronger security interview answers?
YOU FINISHED THE NOTES - NOW BUILD THE RESULT
DON'T JUST GET A 200 RESPONSE.
MASTER AUTH FLOWS
TEST NEGATIVE ACCESS
PRACTICE FASTER WITH AI
PREPARE FOR THE NEXT ROLE

Skills covered

API Testing

Who this resource is for

API Tester