No.

Sorry, this private API was removed by Google, and they haven't release a public API for Google Voice.

Someone might be able to reverse engineer the newer private API, but that's for someone else and another project to do.

According to this post, AuthSub is depreciated now:
https://developers.google.com/accounts/docs/AuthSub

How can I go about getting this to work without being able to generate an authentication key?

I get server errors every time I try to send data ... has the google end been changed?

I am just trying to get this set up as well. I have reached this point shown below

$ python get_auth.py
username:korylprince
application password: beibfifrhedsvmyo

import pygvoicelib
username="korylprince"
apppass=" beibfifrhedsvmyo "
auth_token="DQAAAO8AAAB_4mNBECup67yFPAQa2GZEqkeQn4ntCn1o0DxuYczxMg3vxTRLzeSwIpFNoVSBN1lIBfujpdfD3k-YriCj1G8DgWuyJwzsUjZwFQZCYbaTOurn4wkJhMKbHh90tZWw_Slq3fgZguFZO5Cnv_ldTHDVFHj1TNX1OKwJx7xqQiM2B8B-0s6Y0RTzs0cOcGkxfp2Kfj1gpqNBwnh_xokC3gezk9_-EZ8TcQKK1La1Fa89mx-SLyYyb1AAKqvDTIbaUCoxQLfYtkeJDatW08gx3VXDLqoX0h0sinuxp7T1N0IS8psGlLXTGx_3T6sn0-ygKho"
rnr_se="y9XGAARkGq3WDWEUlJF4igg4MT4="
client = pygvoicelib.GoogleVoice(username,apppass,auth_token,rnr_se)

replace number with phone number below

client.sms(number,"test")

Now I am just confused as what to do at this point. I have tried to copy and past this into a new script file such as send.py but when i run it I still log in and it just does the whole thing again.

I also tried manually replaced "number" with an actual phone number, but still no luck. Is there something I am missing here?

Thanks for the help

I'm trying to use get_auth.py, but I get after putting in my username and application password. It seems to do this with junk data, too which makes me think I might just be putting in bad information.

Isn't it just the e-mail I use with the Voice account?

File "............\pygvoicelib.py", line 137, in _get_auth_token
raise LoginError('unknown', "HTTP Error %d" % (err_code))
LoginError: ('unknown', 'HTTP Error 404')