lti_storage_target in Blackboard

[TomDoesb]

Hi,

I was looking at the code using the postMessage spec and saw this assumes the lti_storage_target being added to the redirectUrl. However Blackboard decided to do this differently and prefer the capabilities check.
https://docs.anthology.com/docs/lti/core/poidc-login-lti_storage_target

Would this be easy to add or is the best way adding this to the redirect url configured in blackboard (since we know they support it)?