Libraries tagged by server-side verification

Pluggable anti-bot / CAPTCHA gate for Laravel Rebel: server-side verification of Cloudflare Turnstile, Google reCAPTCHA v3 and hCaptcha tokens, fail-closed by default and fully audited. Part of padosoft/laravel-rebel-*.

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Server-side verification for InfoPeak Captcha - the privacy-first, EU-hosted captcha. No tracking, no cookies, no puzzles.

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A modern, zero-config Symfony bundle for hCaptcha: server-side verification, Twig widget, Form Type and Validation Constraint.

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Filecheck server SDK for PHP — jobs, uploads, webhooks, and server-side job verification

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Trustport — passkey-based phone verification. Server-side SDK for PHP.

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Server-side international input checks and optional address verification for Shopware 6.

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Accept.js tokenization (PCI SAQ A-EP) with direct card fields (no iframe) Accept Hosted (PCI SAQ A) supported as an alternative hosted flow Apple Pay: server-side merchant validation, cert management via env.php, domain verification support Google Pay: native sheet UX + automatic gateway ID detection PayPal: processed through Authorize.Net’s wallet integration Saved Cards: Authorize.Net Customer Profiles + opt-in save checkbox + saved card dropdown Webhooks: signed (HMAC-SHA512) endpoint + order history updates + event mapping for refunds/voids/chargebacks Security: encrypted API keys at rest, certs stored outside webroot, SSRF hardening, session transaction validation Modern stack: no Knockout dependencies, REST compatible, modular architecture

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Whop payment integration: server-side checkout/plan/product creation, Standard-Webhooks-spec signature verification, and payment re-confirmation. Framework-agnostic — the library takes plain constructor arguments, no env/config coupling.

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Official ORBI Pay Gateway SDK for server-side payments, PaySafe escrow, identity lookup, and webhook verification.

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imzala.org server-side SDK — templates, demands, embedded signing, timestamps, webhook verification.

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Server-side SSO authentication library for Laravel with DPoP verification

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Server-side SDK for game backends integrating with Alogame payment flows. Handles signature verification, timestamp freshness, and request/response envelopes so a partner only implements a handful of business hooks. Ships WebPay (co-pub, HMAC) and Expub (exclusive/direct-publishing, MD5, covers web top-up and Mobile IAP).

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