[Required Update]

[slay2k]

Is your feature request related to a problem? Please describe
As of September 30, 2022, SFMC will require "tenant-specific endpoints" instead of the ones currently used by this gem. The following page explains the changes:

https://help.salesforce.com/s/articleView?id=000357115&type=1

Describe the solution you'd like
In my opinion, the Client method will need to be modified to either accept a tenant-specific endpoint parameter during initialization, or obtain this via the API if that's possible.