To visit your AppKey and AppSecret, you can click here and read more.
$app = new BappPhpSdk($yourAppKey, $yourAppSecret);
$app->create_order('ThisIsOrderId', 1, 'php-sdk sample', 'https://sdk.b.app/api/test/notify/test', 'https://github.com');
$app = new BappPhpSdk($yourAppKey, $yourAppSecret);
$app->get_order('yourOrderId');
$app = new BappPhpSdk($yourAppKey, $yourAppSecret);
$app->is_sign_ok($params);