is_sandbox ? 'https://api-m.sandbox.paypal.com/' : 'https://api-m.paypal.com/'; } public function get_request_args(): array { $args = parent::get_request_args(); $args['user-agent'] = sprintf( 'JetFormBuilder/%s; %s', jet_form_builder()->get_version(), get_bloginfo( 'name' ) ); return $args; } }