private static function dupcheck( $type, $user_id, $template_id, $related_id = '', $engagement_id = null ) {

		$student = llms_get_student( $user_id );

		$query = new LLMS_Awards_Query(
			array(
				'type'          => $type,
				'users'         => $user_id,
				'templates'     => $template_id,
				'related_posts' => $related_id,
				'fields'        => 'ids',
				'no_found_rows' => true,
				'per_page'      => 1,
			)
		);

		$is_duplicate = self::do_deprecated_filter(
			$query->has_results(),
			array( $template_id, $user_id, $related_id ),
			$type,
			"llms_{$type}_has_user_earned",
			"llms_earned_{$type}_dupcheck"
		);

		/**
		 * Filters whether or not the given user has already earned a certificate or achievement.
		 *
		 * The dynamic portion of this hook, `{$type}`, refers to the type of engagement, either
		 * "achievement" or "certificate".
		 *
		 * This filter should return `true` or a `WP_Error` to denote the certificate has already been earned and
		 * `false` to denote that it has not.
		 *
		 * If `true` is returned the default error message will be used.
		 *
		 * @since 6.0.0
		 *
		 * @param boolean $is_duplicate Whether or not the engagement has already been earned.
		 */
		$is_duplicate = apply_filters(
			"llms_earned_{$type}_dupcheck",
			$is_duplicate,
			$user_id,
			$template_id,
			$related_id,
			$engagement_id
		);

		if ( true === $is_duplicate ) {
			$is_duplicate = new WP_Error(
				'llms-engagement--is-duplicate',
				// Translators: %s = the WP_User ID.
				sprintf( __( 'User "%s" has already earned this engagement.', 'lifterlms' ), $user_id ),
				compact( 'type', 'user_id', 'template_id', 'related_id', 'engagement_id' )
			);
		}

		return is_wp_error( $is_duplicate ) ? $is_duplicate : true;

	}