New Token Based Authentication Notifications: how?

I watched the video at: The WWDC 2016 session at

https://developer.apple.com/videos/play/wwdc2016/724/ but I am sorry I was not able to make a sense of it to actually register to send notifications with the new system. I downloaded the APNsAuthKey certificate and got stuck there. The video talks about signing tokens with that but I am totally blank about what that means, when to be implemented in php. Is there some tutorial about how to send notifications with the new token based authentication? My old certificates elapse on March 16 and so I am quite in a hurry to implement the new system. May someone help?

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I found a python tutorial at:

http://http://gobiko.com/blog/token-based-authentication-http2-example-apns/

but unfortunately when I implement it starting with:

import json
import jwt
import time
from hyper import HTTPConnection
ALGORITHM = 'ES256'
APNS_KEY_ID = 'H6Q3X7RYZG'
APNS_AUTH_KEY = 'APNsAuthKey_H6Q3X7RYZG.p8'
TEAM_ID = 'GF9PQ87F68'
REGISTRATION_ID = '713d3a9f4d932ac824caf9373a2f182b2dfa710fb7b6214e3bd405ae1e32d0aa'
BUNDLE_ID = 'com.meditation.iPujaPro'
f = open(APNS_AUTH_KEY)
secret = f.read()
print(secret)
token = jwt.encode(
    {
        'iss': TEAM_ID,
        'iat': time.time()
    },
    secret,
    algorithm = ALGORITHM,
    headers={
        'alg': ALGORITHM,
        'kid': APNS_KEY_ID
    }
)

I get:

Traceback (most recent call last):
  File "simpleNotification.py", line 26, in <module>
    'kid': APNS_KEY_ID
  File "/usr/lib64/python2.7/site-packages/jwt/api_jwt.py", line 56, in encode
    json_payload, key, algorithm, headers, json_encoder
  File "/usr/lib64/python2.7/site-packages/jwt/api_jws.py", line 98, in encode
    key = alg_obj.prepare_key(key)
  File "/usr/lib64/python2.7/site-packages/jwt/algorithms.py", line 226, in prepare_key
    key = load_pem_private_key(key, password=None, backend=default_backend())
  File "/usr/lib64/python2.7/site-packages/cryptography/hazmat/primitives/serialization.py", line 20, in load_pem_private_key
    return backend.load_pem_private_key(data, password)
  File "/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/multibackend.py", line 305, in load_pem_private_key
    return b.load_pem_private_key(data, password)
  File "/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1084, in load_pem_private_key
    password,
  File "/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1253, in _load_key
    self._handle_key_loading_error()
  File "/usr/lib64/python2.7/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1325, in _handle_key_loading_error
    raise ValueError("Could not unserialize key data.")
ValueError: Could not unserialize key data.
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