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guidewire-install-auth

Authenticate production Guidewire Cloud API integrations and survive the auth-side failures — token expiry storms, scope drift, private-CA PKIX errors, secret rotation. Use when hardening OAuth2 token caching, configuring JVM trust stores, or rotating client secrets without downtime. Trigger with "guidewire auth", "guidewire OAuth2", "guidewire token cache", "guidewire PKIX", "guidewire secret rotation".

skills/.curated/guidewire-install-auth/SKILL.md

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# Guidewire Install & Auth

## Overview

Authenticate a backend service to a Guidewire Cloud tenant using OAuth2 client credentials and operate the auth layer in production. This is not a hello-world walkthrough; it is the auth code your service runs at 3am when a token expires mid-batch, when a tenant admin rotates a scope, when a private CA renews a cert, and when on-call needs to swap a leaked secret without dropping in-flight requests.

The four production failures this skill prevents:

1. **Token expiry storms** — every request races to refresh, the Hub rate-limits the auth endpoint, the integration cascades to red.
2. **Scope drift** — a GCC admin removes a scope, every cached token starts returning `403`, retrying does not help.
3. **PKIX path building failed** — JVM cannot validate the tenant's TLS chain because the private CA is not in the trust store; common when carriers front Cloud API with their own DLP appliance.
4. **Secret rotation downtime** — the active client secret is rotated and the old secret stops working before the new one is loaded; in-flight token refreshes fail until restart.

## Prerequisites
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