PHP 8.4+ Implicitly nullable parameters are deprecated

[JJCLane]

There are many instances of this library using implicitly nullable parameters and they need to be updated for PHP 8.4+ support. Let me know if this is on the roadmap or you'd like me to create a PR.

voucherify-php-sdk/src/Api/CustomersApi.php

Lines 120 to 122 in 3a5b8a6

	ClientInterface $client = null,
	Configuration $config = null,
	HeaderSelector $selector = null,

[kasjankotyniarsp]

Hello @JJCLane,

Thank you for your patience. I just released the newest version of the SDK. Feel free to verify whether the SDK works as intented now.

[JJCLane]

@kasjankotyniarsp Thanks, we’ll check it.