Returns the current state of a client. Use it to follow onboarding after POST /baas/Clients:
pending - onboarding is in progress;
active - onboarding is complete, and accounts can be opened;
creatingFailed - onboarding failed;
blocked or closed - the client has been blocked or closed.
The same onboarding outcome is reported with the onboardingCompleted and onboardingFailed webhooks.Returns 404 Not Found if the client does not exist or belongs to another integrator.