I try to migrate to
No, the SENDER_ID is the project ID you signed up at Google API console, it should a numeric string. e.g. on your browser URI, you should see this:
The Sender ID is 4815162342
Google has not updated its docs completely. The above answer is old and its based on this documentation and it seems that its still not updated.
According to updated Google docs, it seems that Project Number on Google API Console is used as SENDER ID