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<p>42flows SEO Meta enables REST API write access to SEO meta fields for posts and pages. It auto-detects your active SEO plugin (Yoast SEO, Rank Math, or All in One SEO) and registers only the relevant meta fields with <code>show_in_rest</code>.</p>
<p>This plugin is required if you use <a href="https://42flows.com" rel="nofollow ugc">42flows</a> to publish SEO-optimized content to your WordPress site. Without it, SEO titles, meta descriptions, and focus keyphrases cannot be set via the REST API.</p>
<h4>Supported SEO plugins</h4>
<ul>
<li><strong>Yoast SEO</strong> — <code>_yoast_wpseo_title</code>, <code>_yoast_wpseo_metadesc</code>, <code>_yoast_wpseo_focuskw</code></li>
<li><strong>Rank Math</strong> — <code>rank_math_title</code>, <code>rank_math_description</code>, <code>rank_math_focus_keyword</code></li>
<li><strong>All in One SEO</strong> — <code>_aioseo_title</code>, <code>_aioseo_description</code>, <code>_aioseo_keywords</code></li>
</ul>
<h4>What it does</h4>
<ul>
<li>Detects which SEO plugin is active on your site</li>
<li>Registers that plugin’s meta fields with <code>show_in_rest => true</code> for posts and pages</li>
<li>Adds <code>sanitize_callback</code> (sanitize_text_field) and <code>auth_callback</code> (requires edit_posts capability)</li>
<li>Does nothing if no supported SEO plugin is detected</li>
</ul>
<h4>What it does NOT do</h4>
<ul>
<li>Does not modify your existing SEO data</li>
<li>Does not add any admin pages, settings, or UI</li>
<li>Does not load any JavaScript or CSS</li>
<li>Does not store any data</li>
</ul>
<h4>Companion plugin installation and upgrades</h4>
<p>When your site is connected to <a href="https://42flows.com" rel="nofollow ugc">42flows</a>, 42flows may request that this plugin install, activate, or upgrade a companion plugin (<code>42flows-content</code>) that enables render-time features for posts delivered by the 42flows pipeline (schema markup, attribution footer, page-optimizer REST surface). The companion plugin is downloaded from <code>https://42flows.com/plugins/42flows-content-latest.zip</code> via the <code>/wp-json/42flows/v1/install-companion</code> REST route.</p>
<p>The route requires the requesting user to hold:</p>
<ul>
<li><code>install_plugins</code> and <code>activate_plugins</code> for fresh installs (typically Administrator role)</li>
<li><code>delete_plugins</code> additionally when a <code>min_version</code> parameter is supplied that exceeds the currently-installed companion version, because the upgrade path deletes the existing companion folder before reinstalling</li>
</ul>
<p>The companion zip URL is hard-coded in the plugin source — it is never user-supplied — so the route presents no SSRF surface. No installation, upgrade, or deletion occurs unless your site is connected to 42flows and the request is authenticated by an administrator-capability user.</p>


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