Optional
client_Specify this to provide your own client assertion JWT rather than
the class creating one for you from the clientAssertionSigningKey
.
Optional
client_If you provide your own client_assertion
you should also provide
the client_assertion_type
.
Optional
client_Specify this to override the parent class's clientId
Optional
client_Specify this to override the parent class's clientSecret
The unique identifier of the target API you want to access.