Provide HTTP Basic Authentication credentials to SearchWP (and WP Cron)

searchwp-customizations.php

<?php

// Provide HTTP Basic Authentication credentials to SearchWP (and WP Cron).
class MySearchWPBasicAuthCreds {
	private $username = 'username'; // HTTP Basic Auth username.
	private $password = 'password'; // HTTP Basic Auth password.

	function __construct() {
		// Provide HTTP Basic Authentication credentials to SearchWP.
		add_filter(
			'searchwp\background_process\http_basic_auth_credentials',
			function( $credentials ) {
				return [
					'username' => $this->username,
					'password' => $this->password,
				];
			}
		);

		// Also provide HTTP Basic Authentication credentials to WP Cron.
		// This can be removed if handled elsewhere, otherwise *REQUIRED*
		add_filter( 'cron_request', function( $cron_request ) {
			if ( ! isset( $cron_request['args']['headers'] ) ) {
				$cron_request['args']['headers'] = [];
			}

			if ( isset( $cron_request['args']['headers']['Authorization'] ) ) {
				return $cron_request;
			}

			$cron_request['args']['headers']['Authorization'] = sprintf(
				'Basic %s',
				base64_encode( $this->username . ':' . $this->password )
			);
			
			return $cron_request;
		}, 999 );
	}
}

new MySearchWPBasicAuthCreds();