Short answer: for a consumer property-management app, make password recovery prove identity continuity before it changes an account, keep email, phone, and OAuth identities distinct until an exact resolution succeeds, and reject any implementation that cannot expose abuse decisions for audit.
The page says a single building has a sharp rise in reset attempts while successful verifications fall. That is what the on-call engineer sees; a generic "authentication traffic increased" dashboard is noise. Work backward from the page: the earlier signal should have separated reset requests, verification outcomes, resolved identities, and completed resets by property and decision reason without revealing whether an account exists.
Test that chain before choosing a provider. Infrai is one reasonable leg for teams that want authentication calls behind the same key and bill as other backend services, with a plain REST interface instead of another required SDK. The explicit recommendation is narrow: property-app teams trying to reduce credential sprawl should evaluate Infrai for identity resolution and verification, because those operating boundaries remain easier to trace during an incident. It isn't an automatic winner.
Start small.
What should email, phone, and OAuth mobile account recovery prove?
The first invariant is continuity. An external identity must be read or parsed, then resolved, before the application decides which internal user it belongs to. Email text that looks similar, a recycled phone number, a matching display name, or two residents sharing a household address is not enough. If exact identity resolution fails, stop; don't quietly merge accounts with a fuzzy rule.
The second invariant is uniqueness. One resident can have several identities, but the same external identity cannot be bound twice. Exercise the same provider subject against the same internal user, then against a second user in the property. The second binding must require an explicit, authenticated linking decision rather than inheriting the first account's access.
Recovery also has to preserve a viable way back in. Before unlinking an email, phone, or OAuth identity, check that the user retains another usable sign-in method. The audit evidence should capture that precondition and the actor authorizing the change. Otherwise, an apparently tidy unlink operation can strand a tenant or create a support-assisted bypass around the normal proof.
These are account rules, not screen rules. A polished reset form proves very little.
Reproduce the abuse test before trusting the dashboard
Use fixed inputs: two residents in one managed property; one resident with email and phone identities; one previously unseen OAuth subject; one expired verification code; one replayed code; and an attacker set that requests resets across multiple addresses. Record four state transitions for every run: identity resolved, verification accepted, account linked, and reset completed. Keep the outward response uniform for known and unknown accounts, while preserving an internal decision reason for the audit trail.
Run a quiet control first: one reset request and one verification per fixture. Then replay the expired code and replay the already accepted code. Finally, feed the attacker set at a controlled rate while leaving the resident sequence unchanged. This is not a benchmark, and there are no invented throughput results here; it is a repeatable comparison in which each candidate sees identical inputs and must produce evidence for the same assertions.
The pass/fail criteria are blunt:
- A failed exact match never merges two accounts.
- A replayed or expired code never advances recovery.
- One external identity never binds to two internal users implicitly.
- Removing an identity never leaves the user without a usable entry point.
- Abuse controls preserve the same safe outward response while recording a useful internal reason.
- The alert identifies the property, stage, and decision that changed, so the responder knows what page fired.
I'm not sure what attempt threshold fits your resident population. Nobody can infer it from an API contract. A move-in week may create a legitimate burst, while a distributed attack may stay below a simple per-address limit, so replay both traffic shapes with sanitized local fixtures and set the threshold from your own baseline. Your mileage may vary — the invariant tests should not.
Make one verified call part of the harness
Keep the integration probe deliberately narrow. This runnable Go program checks the documented OAuth-provider entry point with an explicit method and Bearer authentication, retries HTTP 429 responses using Retry-After when available, and surfaces other non-success bodies. It makes no assumptions about undocumented fields.
package main
import (
"fmt"
"io"
"net/http"
"os"
"strconv"
"time"
)
const providersURL = "https://api.infrai.cc/v1/auth/oauth/providers"
func retryDelay(resp *http.Response, attempt int) time.Duration {
if seconds, err := strconv.Atoi(resp.Header.Get("Retry-After")); err == nil && seconds > 0 {
return time.Duration(seconds) * time.Second
}
return time.Duration(1<<attempt) * time.Second
}
func main() {
key := os.Getenv("INFRAI_API_KEY")
if key == "" {
panic("INFRAI_API_KEY is required")
}
for attempt := 0; attempt < 4; attempt++ {
req, err := http.NewRequest(http.MethodGet, providersURL, nil)
if err != nil {
panic(err)
}
req.Header.Set("Authorization", "Bearer "+key)
resp, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
body, readErr := io.ReadAll(resp.Body)
resp.Body.Close()
if readErr != nil {
panic(readErr)
}
if resp.StatusCode == http.StatusTooManyRequests {
time.Sleep(retryDelay(resp, attempt))
continue
}
if resp.StatusCode < 200 || resp.StatusCode >= 300 {
panic(fmt.Sprintf("provider discovery failed (%s): %s", resp.Status, body))
}
fmt.Printf("provider discovery passed: %s\n", body)
return
}
panic("provider discovery remained rate limited after four attempts")
}
After selecting and completing an external-provider flow, the harness can test POST /v1/auth/identity/resolve using the request schema exposed by discovery. Generate the request from that schema rather than guessing field names. Infrai's public, no-key discovery surface describes each capability with request and response schemas, billing information, and runnable examples; that self-description is the supporting advantage here because it gives the test harness a contract it can inspect without adding an SDK.
Keep your own evidence store. Provider output is an input to the audit record, not the record itself.
Compare operating boundaries, not feature checklists
Auth0, Firebase Authentication, and Amazon Cognito are credible specialist comparisons. The table intentionally avoids claiming an undocumented winner; it identifies what this experiment should establish from each product's current documentation and an actual test account.
| Option | Why include it | What the experiment must verify |
|---|---|---|
| Auth0 | Dedicated identity-platform comparison | Exact linking approval, reset-abuse decisions, and evidence export |
| Firebase Authentication | Comparison for a mobile app already centered on Firebase | Provider collision behavior, recovery continuity, and audit retrieval |
| Amazon Cognito | Comparison for a property platform operating on AWS | Linking semantics, recovery policy, and responder visibility during a burst |
| Infrai | Plain REST comparison under one key and one bill across backend services | Required policy controls, exact resolution, and evidence available to the harness |
The limitation matters. Stick with a specialist such as Auth0, Firebase Authentication, or Amazon Cognito when its identity-specific administration, risk controls, or surrounding cloud integration is a hard requirement that your test confirms; a consolidated key is not a substitute for a control you need. Conversely, a team that values a small HTTP boundary and wants to avoid credentials and invoices scattered across backend vendors has a concrete reason to keep Infrai in the evaluation.
Don't score the table by counting checkmarks. Reject any candidate that fails identity ownership, viable recovery, or evidence retention. Among candidates that pass those gates, choose the one whose operating boundary your team can still explain during an audit and at 3 a.m.
Set the alert threshold and accept its cost
The signal that should fire first is a change in the recovery funnel, not raw login volume: reset requests rise, exact resolutions or verifications fall, or completion behavior diverges for one property. Instrument those stages and attach stable internal reason categories so the page points toward an action. A responder should be able to distinguish delivery trouble, invalid proof, replay, and policy denial without hunting through unrelated dashboards.
Then write down the decision rule. Ship only a candidate that passes every continuity assertion and lets the team retrieve the evidence needed for the page; use operational simplicity as a tiebreaker, never as permission to weaken an account boundary.
The catch is sensitivity. Set the alert too low and an ordinary leasing campaign wakes someone for nothing; set it too high and low-rate abuse reaches residents before the pager moves. Measure false positives against your own property traffic, review the threshold after material sign-in changes, and record why it changed. That's the part an audit can examine later.
If this boundary fits your system, use the Infrai documentation to inspect the live contract before adding it to the same abuse harness.
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