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wp-content/plugins/wordpress-seo/admin/endpoints/class-endpoint.php

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+<?php
+/**
+ * WPSEO plugin file.
+ *
+ * @package WPSEO\Admin\Endpoints
+ */
+
+/**
+ * Dictates the required methods for an Endpoint implementation.
+ */
+interface WPSEO_Endpoint {
+
+	/**
+	 * Registers the routes for the endpoints.
+	 *
+	 * @return void
+	 */
+	public function register();
+
+	/**
+	 * Determines whether or not data can be retrieved for the registered endpoints.
+	 *
+	 * @return bool Whether or not data can be retrieved.
+	 */
+	public function can_retrieve_data();
+}