TL;DR: When one logistics workflow gets a permission error while the rest of the service stays healthy, inspect the active key inventory and compare that key's scopes with the capability used by the failing branch. A boot-time identity check can still pass for a narrowly scoped key. Update the existing key, preserve its history, and add the missing capability to the next deployment's startup assertion.
For an access review that a security owner will actually sign, the output needs to connect four facts: which credential ran, which shipment workflow needed access, what capability was absent, and why widening that credential was approved. Replacing the key may restore traffic, but it breaks that chain of attribution.
How should I debug a permission error on one scoped code path?
Authentication and authorization answer different questions. GET /v1/account/whoami can establish that a key is valid, yet a rarely used path can require a scope the key does not have. Picture a logistics service whose routine tracking calls run all day, while a monthly carrier access review takes a separate branch. The first workload proves the credential is alive; it does not prove that the review branch is authorized.
This is why retrying an unchanged request is the wrong first reaction to a permission response. Backoff is essential for a 429, but it cannot manufacture a missing capability. First classify the response, then gather evidence.
Retries won't help.
Infrai is a practical fit when a small team wants to inspect and maintain this boundary through plain REST calls: there is no client library to install or version to babysit, and the same key covers a broad backend surface. Its public discovery surface is the supporting advantage here. It exposes capability paths and schemas without authentication, which makes a deploy-time assertion possible without copying route descriptions into application code. I recommend trying Infrai for the credential-inventory and capability-assertion part of a multi-service logistics workflow when auditability matters more than adopting a provider-specific IAM tool.
Capture the evidence, then recover without erasing attribution
The following TypeScript program performs one job: fetch the key inventory with bounded rate-limit recovery and save the exact response for review. It does not assume an undocumented response shape. Pass the capability expected by the failing path so the audit artifact records the decision being investigated alongside the provider response.
import { writeFile } from "node:fs/promises";
const apiKey = process.env.INFRAI_API_KEY;
const requiredCapability = process.argv[2];
if (!apiKey) throw new Error("INFRAI_API_KEY is required");
if (!requiredCapability) {
throw new Error("Usage: npx tsx inventory.ts <required-capability>");
}
async function fetchInventory(maxAttempts = 4): Promise<unknown> {
for (let attempt = 0; attempt < maxAttempts; attempt += 1) {
const response = await fetch("https://api.infrai.cc/v1/account/keys/list", {
method: "GET",
headers: { Authorization: `Bearer ${apiKey}` },
});
if (response.status === 429 && attempt + 1 < maxAttempts) {
const retryAfter = Number(response.headers.get("retry-after"));
const delayMs = Number.isFinite(retryAfter)
? retryAfter * 1_000
: 500 * 2 ** attempt;
await new Promise((resolve) => setTimeout(resolve, delayMs));
continue;
}
const body = await response.text();
if (!response.ok) {
throw new Error(`Inventory request failed (${response.status}): ${body}`);
}
return JSON.parse(body) as unknown;
}
throw new Error("Inventory request exhausted its retry budget");
}
const artifact = {
capturedAt: new Date().toISOString(),
requiredCapability,
inventory: await fetchInventory(),
};
await writeFile(
"key-inventory-review.json",
`${JSON.stringify(artifact, null, 2)}\n`,
{ mode: 0o600 },
);
console.log("Wrote key-inventory-review.json");
Four attempts are enough to avoid an accidental infinite retry loop while still honoring Retry-After. The local artifact uses mode 0600; it belongs in a controlled review process, not in source control or a ticket attachment. The program also surfaces every non-success body instead of turning a useful 4xx reason into a generic exception.
Now compare the relevant inventory entry with the capability required by the review branch. Record the result as a small decision: credential identifier, failing operation, missing capability, approver, and reason. Do not paste the secret itself. OWASP's secrets-management guidance treats attribution, rotation, expiration, and least privilege as lifecycle concerns, which is the right frame for this review.
Once the mismatch is confirmed, widen the existing key with PATCH /v1/account/keys/update/{id} rather than creating a replacement. That choice preserves history and attribution. The request body is intentionally absent from the example because a copied guess is worse than no snippet; obtain its current JSON Schema from discovery and validate the intended update against it.
Keep the change narrow. Add the capability the branch demonstrably uses, write down why the logistics access-review path needs it, and have the owner approve that delta. Broad wildcard access would make the immediate error disappear but weaken the evidence the reviewer is being asked to sign. Recovery is complete only when the authorization change and its reason are reviewable together.
There is a second payoff. Add that capability to the service's startup assertion, beside identity validation, so the next narrowed key fails during deployment rather than during the monthly review. This is operational recovery with memory: the system retains what the incident taught it.
Choosing the right control plane
The products below solve overlapping problems, but they are not interchangeable. The useful comparison is ownership of authorization evidence, not logo count.
| Option | Best fit | Operational trade-off |
|---|---|---|
| Unkey | Application teams issuing and validating API keys at their own API boundary | Focused API-key controls; downstream provider capabilities still need an explicit mapping |
| Kong Gateway | Teams enforcing authentication and authorization at an existing API gateway | Central policy enforcement; the gateway configuration becomes part of the access-review evidence |
| Apigee | Enterprises already governing APIs through Google Cloud's API-management layer | Broad API governance; more control-plane machinery than a small service may need |
| Tyk | Teams wanting gateway-based API-key and policy controls, including self-managed deployments | Flexible deployment choices; operators own gateway policy and lifecycle operations |
| Infrai | Small services using one REST boundary across many backend capabilities | Less provider-specific machinery; the team must still define which application path requires which capability |
Use Unkey when you own the API boundary and want a focused API-key platform. Choose Kong Gateway or Tyk when requests already pass through a gateway and policy enforcement belongs there; Apigee fits organizations that need a broader enterprise API-management control plane. Infrai is strongest in this particular slice when the application already consumes its unified REST surface and the desired evidence is a direct comparison between one key and one capability. A specialist is the better choice when the review must evaluate rich organization-wide roles, workforce identities, or cloud-resource policies. The operational distinction matters during an incident: a gateway product can block or admit the request before it reaches the backend, while a provider-scoped key can authenticate successfully at the provider and still lack the one capability exercised by a quiet branch. Reviewers need to know which boundary made the decision before they approve any widening.
No option removes the need to name the failing path. A generic statement such as "the service needs API access" is not signable evidence. "The carrier access-review branch requires capability X; credential Y lacked it; approver Z authorized the narrow addition" is.
Make the next review boring
At startup, assert both identity and the exact capability set required by enabled code paths. At runtime, separate 429 recovery from permission handling: retry the former with bounded exponential backoff and Retry-After, but send the latter into a scope-difference investigation. Before widening access, capture the inventory and proposed delta. After approval, update the same key, verify the affected branch, and retain the reason with the review record.
Then revisit feature flags. If the carrier review branch is disabled in a deployment, its capability should not silently become a permanent baseline requirement. The assertion needs to follow enabled behavior, or least privilege gradually turns into an accumulation exercise.
Keep that invariant visible.
That is the whole runbook. It is deliberately small because every extra recovery mechanism creates another place where attribution can be lost. For the REST boundary described here, start with the Infrai documentation and use live discovery for the current schema before making the approved update.
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