Docs update: Ultimate Multisite v2.15.2

Start with the three named pages: settings-reference.md, paypal.md, and the-registration-flow.md, and compare each requested statement with the referenced v2.15.2 implementation files. Update only those pages, leave generated docs/developer/hooks/ unchanged, then run the documentation repository’s Markdown and link checks; completion means all listed v2.15.2 behavior is documented accurately.

Release

Ultimate Multisite v2.15.2 — released 2026-09-08

Required doc updates

• docs/user-guide/administration/settings-reference.md — explain that SSO is disabled by default until explicitly enabled, and document MCP availability requirements: WordPress 6.9+, the canonical network-active MCP Adapter plugin, and MCP Adapter 0.6.1+.
• docs/user-guide/payment-gateways/paypal.md — state that PayPal webhook registration requires a public HTTPS listener and describe correcting the Network Site URL or WU_GATEWAY_LISTENER_URL when validation fails.
• docs/user-guide/configuration/the-registration-flow.md — clarify that an existing WordPress account must authenticate before checkout can use that account; submitting the account email while logged out is rejected.

The new checkout transaction hooks are covered by the auto-generated docs/developer/hooks/ content and need no manual edit.

Changelog entry

Version [2.15.2] - Released on 2026-09-08
- Fix: Checkout now requires existing WordPress users to log in, preserves correct membership expiration dates, and publishes pending sites only after signup records are committed.
- Fix: SSO magic links now recognize direct custom domains, and SSO remains disabled until administrators explicitly enable it.
- Fix: Setup wizard conditional fields and wp-config.php updates now behave reliably without duplicate constants.
- Fix: Site duplication preserves empty plugin table schemas, settings stay isolated per network, and transient database misses recover correctly.
- Fix: PayPal setup now rejects invalid webhook URLs with guidance for configuring a public HTTPS endpoint.
- Fix: MCP integration now requires the canonical network-active MCP Adapter and reports missing or unsupported dependencies.
- Fix: Order bump controls, translations, PHP 8.5 compatibility, and bundled frontend dependencies no longer emit known warnings or build failures.
- Improved: Front-end My Sites toolbar queries are lighter on large networks, while dependency and CI maintenance improves release reliability.

Reference implementation

• SSO default: inc/sso/class-sso.php
• PayPal listener validation: inc/gateways/class-paypal-rest-gateway.php
• Existing-account checkout authentication: inc/checkout/class-checkout.php
• MCP dependency checks: inc/class-mcp-adapter.php

Verification

• Confirm each statement against Ultimate Multisite tag v2.15.2.
• Run the docs repository Markdown/link checks for the three edited pages.
• Do not manually edit generated hook pages.

Auto-generated by /wp-release

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