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For the Flutterwave entry, make webhook authentication and idempotent business handling separate checks.

Flutterwave's webhook guide documents acknowledgment behavior and repeated deliveries. Use the authentication mechanism for the integration's API version, verify the event, and ensure the same payment cannot fulfill the same order repeatedly.

Test a duplicate notification and a temporary processing failure in a controlled environment. Avoid redirects on the acknowledgment path when the documented contract expects a direct 200 response.

For the Flickr entry, do not describe repeated search-page requests as an unlimited archive export.

Flickr's photo-search reference limits access to the first 4,000 results for a query. Increasing the page size does not remove that ceiling.

Use appropriately narrowed, authorized queries when the task requires more complete coverage, and record the scope each query represents. Keep search sampling distinct from a verified complete collection so downstream counts are not overstated.

For the Flaticon entry, confirm API access independently of ordinary website membership.

Flaticon's v3 documentation describes exchanging a private API key for a temporary token, with a documented 24-hour lifetime. Keep the private credential out of public client code and handle token expiry intentionally.

Test one permitted search and asset operation, then exercise an expired-token response. A successful request immediately after setup is not enough to establish that the integration remains usable the next day.

For the Fixer.io entry, read the response's base instead of assuming it matches the currency selected in your interface.

The provider's comparison guide explains that base-currency flexibility depends on the service and plan. When both rates are quoted against the same base, converting from one non-base currency to another requires the appropriate ratio, not direct multiplication by the destination rate alone.

Test both directions with a controlled example, preserve precision during calculation, and label the rate's timing.

The Fivehundredpx entry needs a lifecycle correction before anyone follows its historical API examples.

500px's official support notice states that public API access ended in 2018 and directs further usage inquiries to its sales team. Old public documentation does not establish that fresh developer keys can be obtained today.

Confirm any current commercial arrangement directly with the provider. Keep access to the website separate from permission and technical access to an API.

For the Fitbod Training entry, verify the intended access path before promising custom synchronization.

Fitbod's official integration help documents supported app connections. That is not by itself a public endpoint contract for arbitrary third-party software, and a current self-service public API was not verified in this review.

Confirm the supported direction, data types, and history coverage for the chosen connection. Avoid inventing OAuth scopes or endpoints from an unavailable developer URL.

The Fitbit Web API entry needs the updated transition dates, not an older cached deadline.

Google's current notice distinguishes support ending on September 30, 2026 from operational shutdown on October 30, 2026 after the announced extension. It also states that the Google Health API is not currently onboarding new projects.

Check eligibility and the migration path before promising a replacement integration. A separate extension for demo-account lifetime should not be read as extending the legacy API's operation beyond its stated shutdown date.

For the Fitbit entry, treat migration to Google Health as more than changing an endpoint.

Google's data-access migration guide states that users must authorize the new access and that legacy Fitbit tokens do not transfer. The new identity flow also differs from the former token response.

Plan how an authorized user's new identity is linked to the correct existing record without guessing from a display name. Check project eligibility and the current rollout restrictions before scheduling a live migration.

For the Fireworks Inference entry, check which schema features the selected output mode actually enforces.

Fireworks' formatting guide describes limitations on pattern handling, including unsupported regex constructs, and warns that length-limited output can be truncated.

Validate the final object before using it. Test an unsupported constraint and a deliberately short output limit so the client does not treat a successful HTTP response as proof of a complete, schema-valid result. Keep incomplete output visibly incomplete.

For the Fireworks AI entry, handle streamed tool arguments as fragments, not independent executable requests.

Fireworks' function-calling guide describes assembling tool-call data by its index. The model proposes a call; the application validates and executes an allowed operation, then returns the result.

Wait for complete arguments and apply schema and permission checks before acting. Test fragmented JSON and multiple calls so one tool's arguments are not accidentally joined to another's.

For the Firebase Cloud Messaging entry, distinguish an accepted send from observed delivery.

Firebase's lifespan guide explains message retention and notes that a time-to-live of zero discards a message that cannot be delivered immediately.

Choose expiry behavior for the actual notification purpose and test an offline device. Do not display 'delivered' solely because the send response contains a message identifier. Time-sensitive content should also remain understandable if the device receives it later than expected.

For the Firebase entry, distinguish project identification from permission to read or write data.

Firebase's API-key guide explains the role of keys used for Firebase services and the separate access controls enforced through Security Rules or IAM. Do not generalize that guidance to every Google Cloud API key.

Test allowed and forbidden operations with representative user identities. Hiding a client configuration value is not a substitute for correctly restricting the underlying resources.

For the Finnhub entry, identify the resolution and adjustment rules before combining price series.

Finnhub's candle documentation distinguishes split-adjusted daily prices from unadjusted intraday prices. Splicing those values without explanation can introduce an artificial discontinuity around a split.

Keep the returned status separate from the numeric series; a no-data response is not a zero price. Test a known boundary case and label the data's conventions before using it in charts or analysis.

For the Finicity entry, do not build an unrestricted polling loop around account refresh.

Mastercard's official refresh reference describes restrictions on automated refresh and the account metadata used to assess aggregation attempts. A disconnected request does not necessarily cancel an operation already underway.

Follow the approved refresh workflow and inspect its actual outcome before retrying. Use authorized test accounts and keep incomplete aggregation distinct from a confirmed absence of transactions.

For the Figma entry, avoid one universal requests-per-minute assumption.

Figma's REST documentation describes limits affected by endpoint tier, seat, and the plan associated with the resource. A paid seat elsewhere does not automatically raise the allowance for a file in a different plan context.

Respect the returned retry guidance and schedule work around the actual requests being made. Test the integration against the kinds of files it will really access, not only the developer's own workspace.

For the FedEx entry, understand what the selected sandbox actually exercises.

FedEx's virtualization guide explains that predefined responses can ignore changes to parts of the input. A successful sandbox rate response should therefore not be treated as proof of a live price or complete address validation.

Use it to test request construction and response handling, then follow the provider's approved process for validating production behavior. Label fixtures clearly so sample values cannot be mistaken for an actual shipping quote.

For the FDA Drug API entry, preserve the limits of the underlying reports when presenting results.

openFDA's event documentation explains that one report can list multiple drugs and reactions without assigning each reaction to a specific drug. Expanding every combination into a table does not create proven causal pairs.

Label the data as reported events and avoid converting counts into individual treatment advice. Keep report context and query scope visible so a technical aggregation is not mistaken for a medical conclusion.

For the FatSecret Platform entry, check whether a returned serving is valid for the next operation.

The food.get v5 reference documents derived standardized servings with serving_id=0. They can be displayed, but that value cannot be used directly with food_entry.create.

Keep display normalization separate from a user's selected loggable serving. Test the selection-to-entry path and preserve units explicitly instead of assuming every displayed row carries an interchangeable serving identifier.

For the FastSpring entry, deduplicate both delivery events and the underlying business operation.

FastSpring's webhook overview distinguishes automatic retries, which preserve an event ID, from manual retries, which create a new one. Event-ID-only deduplication can therefore miss a manually replayed operation.

Test both retry paths with a disposable order and confirm fulfillment remains idempotent. Keep enough context to explain why an event was already handled without exposing customer or payment details.

For the Fastly entry, choose the purge behavior that matches the intended cache outcome.

Fastly's soft-purge guide explains that a soft purge marks content stale. It is not equivalent to requiring every subsequent request to avoid that cached content under all circumstances, and purge-all does not support the same soft behavior.

Test the relevant cache and revalidation settings with a disposable resource. Avoid a service-wide purge when the task only concerns a narrowly identified item.

For the fal Inference entry, do not equate a terminal queue state with a usable generated asset.

fal's queue guide documents completion alongside result and error handling. Fetch and inspect the result, including any error information, before marking the request successful in the application.

Keep submission, processing, and usable output as distinct states. Test a failed inference that reaches a terminal state so the interface does not display a broken download as a completed generation.

For the FakeStoreAPI entry, use write responses as practice fixtures, not evidence of a durable backend.

The maintainer's documentation explains that create, update, and delete operations are simulated. A returned object or identifier does not guarantee that a later GET will contain the mutation.

Test UI transitions with that limitation explicit, and use a controlled persistent test service when the application needs to verify read-after-write behavior. Do not diagnose the documented simulation as random data loss.

The Faker Generator entry points to a hosted fake-data service, but its current official documentation and endpoint behavior could not be verified during this review.

Do not assume that examples for similarly named services or different API versions share parameter names, quantity limits, or seeding behavior. Obtain a working provider reference before making those claims.

Keep the uncertainty narrow: a failed documentation check does not establish a permanent shutdown. Test availability separately from the application's ability to handle a known sample response.

For the Faker API entry, keep a small, clearly synthetic fixture for tests that need a stable result. A live generator is useful for exploration, but changing output can make a regression hard to reproduce.

Current provider behavior was not verified in this review, so do not promise a particular seed, locale, or response contract without checking the applicable documentation.

Separate live-service availability tests from deterministic application tests. Exercise empty and malformed fixture cases deliberately instead of waiting for random output to reveal them.

For the Facebook Graph entry, distinguish user authorization from acting on behalf of a managed Page.

Meta's official Page-token example uses a User token to discover managed Pages, then selects the Page identity and corresponding access token. Those token types are not interchangeable labels for the same authority.

Test the intended Page and operation with the required permissions. Keep credentials private and avoid copying an old API-version number as though it were verified current support.