Code documentation for IDE

[sp72]

Hello,

It would be nice if we can have documentation in our IDE when using your \ChargeBee_Model classes.
The implementation of \JsonSerializable can be also useful.
Namespace support is nice too but not really useful every day.

Thanks.

[yched]

It's 2023, the total lack of type hintings (in method signatures, or using phpdoc if compatibility with older (and soon out-of-support) versions of PHP is deemed important), is starting to feel very outdated :-/