Potentially outdated API paths

[bwmirek]

In the official Przelewy24 documentation, different paths are given than those used in the plugin.

Example:

Official path to register transaction: https://sandbox.przelewy24.pl/api/v1/transaction/register

Plugin path:

public const SANDBOX_HOST = 'https://sandbox.przelewy24.pl/';

public function getTrnRegisterUrl(): string
    return $this->getHostForEnvironment() . 'trnRegister';
}

As you can see, it's missing /api prefix and API version and path name is different itself. What are origin of that plugin routes?