Register Session API

{  "ok": true,  "message": "Session registered. Private-data endpoints will read as your account.",  "username": "myhandle"}

{  "error": "bad_request",  "message": "Missing or malformed parameter. Fix the request before retrying."}

{  "error": "unauthorized",  "message": "The API key is missing, malformed, or revoked. Check the Authorization header."}

{  "error": "insufficient_credits",  "message": "Your balance is exhausted. Top up your credits to continue."}

{  "error": "forbidden",  "message": "The acting account is not authorized for this write action, or has no logged-in session."}

{  "error": "not_found",  "message": "The resource does not exist, for example a deleted tweet or a private account."}

{  "error": "rate_limited",  "message": "Too many requests. Back off and retry with exponential backoff."}

{  "error": "server_error",  "message": "Something failed on our side. Retry with backoff; if it persists, contact support."}