[Feat]: Sub-Account Customer Portal Support

[rohan-frate]

Feature Request Is New

• [x] I have verified that the requested feature does not already exist or has not already been requested.

Description of the feature

Hi,

I noticed that EasyPost recently introduced a new Customer Portal endpoint to help manage sub-accounts more easily. I was wondering if there are any plans to add support for this in the easypost-python SDK?

If not, I’d be happy to contribute a PR to add this functionality. Are there any guidelines or requirements I should be aware of before contributing?

Thanks,
Rohan