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Example code of kaidn/kaidn-php

Informations about the package kaidn-php

Kaidn

Packagist version PHP version tests license MIT docs

# kaidn/kaidn-php Official PHP client for [Kaidn](https://kaidn.io), the fraud and abuse scoring API. Send one user action, get back `allow`, `review` or `block`, with the reasons attached. **No Composer dependencies.** This runs in your signup and checkout path, so every package it pulled in would be one more thing that can break your deploy or appear in your audit. It uses `ext-curl`, which is on effectively every PHP host including shared cPanel. **PHP 7.4 and up**, deliberately. 7.4 is long past end of life upstream and it is what a lot of the rewards and affiliate shops using this actually run: one live site on Kaidn today is on 7.4.33. A client that refuses to install is worse than one written without enums and constructor promotion. Server-side only: it holds your secret key, so never expose it to a browser. The browser half is [`@kaidn/fp`](https://www.npmjs.com/package/@kaidn/fp) and uses a separate publishable key. ## Score an event `event` is the only required key, and the name is yours to choose. Send whatever else you already collect; the answer sharpens as you send more. The three cases people actually use: ## Read the evidence Every verdict shows its work. `key` is the config key you would edit to retune that check. ## Recognise a returning device: rung 1 A browser fingerprint is not a person: on production traffic one iOS Safari fingerprint covers 2.30 different people. So use `resolved_id`, never `id`, and weigh it with `collision_risk`. Better still, stop guessing. Store the token Kaidn returns as a cookie on your own domain and pass the request's `Cookie` header back next time: Measured on one browser across two visits, with the IP changed in between: | | visit 1 | visit 2 | | --- | --- | --- | | `resolution` | `probabilistic` | **`deterministic`** | | `resolution_rung` | 2 | **1** | | `collision_risk` | 0.12 | **0.01** | **Your server has to set the cookie, not us.** Browsers judge a cookie by the domain that sent `Set-Cookie`, so one set from your backend on your own domain is genuinely first-party and lasts ~400 days. Anything a vendor sets from its own infrastructure is capped at 7 days on Safari, including the CNAME'd "custom subdomain" setups other vendors ask you to configure. No DNS record, no proxy. **It is off until you pass `cookie`, deliberately.** Storing something on a visitor's device needs consent or a strict-necessity basis under the ePrivacy Directive, and GDPR legitimate interest does not substitute for it. You are the controller here. ## Dedupe one inbox, not one address `[email protected]`, `[email protected]` and `[email protected]` are one mailbox. Store both: mail the address they typed, dedupe on the canonical one. ## Everything the key can reach If an endpoint takes an API key, it is a method here. | | | | --- | --- | | `score($event)` | score one action | | `scoreWithCookie($event, $cookieHeader)` | the same, carrying the device identity | | `checkEmail()` `checkIp()` `checkPhone()` | judge one identifier, no event recorded | | `batchScore()` `batchCheck()` `batchLists()` | bulk, 1 quota unit per row, 1000 per call | | `lists()` `listAdd()` `listRemove()` | allow / blocklists | | `config()` `setConfig()` | your weights and thresholds | | `label()` | report a real outcome | | `forget()` `suppressions()` | GDPR erasure and its audit | | `events()` `stats()` | read your own data | | `graphSharing()` | opt into the cross-operator graph | | `health()` | public liveness and intel dataset sizes | Runnable versions in [`examples/`](examples/). ## Errors Everything throws `Kaidn\KaidnException`, carrying the API's own message. Network failures, timeouts, 429s and 5xx are retried automatically (2 extra attempts, honouring `Retry-After`). A 4xx is not: a bad key fails identically the second time, and retrying only spends quota and delays the error reaching whoever can fix it. **Fail open.** A fraud vendor that can take down your signup form is a worse problem than the fraud: ## Fields we have not named yet Every response keeps what this version does not recognise, so a signal the API ships next week reaches code running the release you installed last year. Requests work the same way: any extra key in the array you pass to `score()` is sent untouched. ## Configuration ## Links - [Docs](https://kaidn.io/docs) · [Guides](https://kaidn.io/docs/guides) · [Glossary](https://kaidn.io/glossary) - [Pricing](https://kaidn.io/pricing): 10,000 events a month free, no card MIT

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