Lack of nullability of reference types

[charlesroddie]

Describe the bug

Properties that should be nullable are not listed as nullable if they are reference types.
For example, in a session s, s.AmountTotal is correctly Nullable<int64>, but s.ClientReferenceId is a string when it should be a string?.
Discrepancy between:

• https://docs.stripe.com/api/checkout/sessions/object?lang=dotnet

• stripe-dotnet/src/Stripe.net/Entities/Checkout/Sessions/Session.cs

  Line 95 in a18e87f

  public string ClientReferenceId { get; set; }

Presumably this library was never updated to support nullable reference types.

I would estimate it would take 2x longer to write dotnet code without nullable reference types, since for every use of a property you would need to refer to the online documentation to see if it is nullable or not and add manual casts to nullable before proceeding.

To Reproduce

1. Get a Session s
2. Type s.ClientReferenceId
3. The result is a string

Expected behavior

The result should be a string?.

Code snippets

No response

OS

Windows

.NET version

dotnet9

Library version

current

API version

current

Additional context

No response