A practical starting point.
An API is a permission boundary as much as a data interface. Start by making the expected relationship between a caller, an action, and a resource explicit. Then decide where that relationship is enforced and what evidence shows that it worked. API Sentinel organizes that work into an owned, testable review rather than a one-time checklist.
Know the surface
Inventory active routes, versions, webhooks, workers, and administrative paths. Give every exposed interface an owner and a retirement plan.
Check the resource
Authenticate the caller, then authorize the specific object and action. Carry tenant context through lists, exports, and background jobs.
Keep useful evidence
Record policy decisions and application outcomes with enough context to investigate, without copying credentials or unnecessary payloads.
Turn the concept into a review.
Start with one workflow
Choose a consequential operation such as a document export. Identify the user, tenant, data owner, service identity, and every downstream action. Describe which combinations should be allowed before writing policy.
Test the negative cases
Use owned test accounts and synthetic resources to check cross-tenant access, revoked membership, read-only roles, and missing credentials. A successful valid request is only half of an authorization test.
Make change reviewable
Version permissions and request contracts alongside code. Give exceptions an owner, reason, and expiry. Link each important change to a reproducible test and a specific rollback decision.
Questions worth asking.
Is authentication enough?
No. A recognized caller can still lack permission for a particular object or action. Design and test both identity verification and resource-level authorization.
Where should a small team begin?
Choose one sensitive workflow, name its owner, write down its access rules, and test allowed and denied cases. Expand from that working example rather than producing an unowned inventory.
Go deeper in the journal.
API security checklist: build a stronger first line of defense
A practical path from endpoint inventory to access controls, resource limits, and a release process your team can repeat.
Prevent BOLA in multi-tenant APIs: authorize the object, not just the route
Turn tenant boundaries into explicit resource checks, negative tests, and safer background-job behavior.
API incident response: a practical playbook from signal to recovery
Prepare a calm response to suspicious API activity with clear authority, scoped containment, and evidence-based recovery.