Apple developer token取得方法を教えてください。

自分で取得について調べて実行して見たのですが、よくわからないエラーなどで、上手く行きませんでした。
どなたか取得についての方法、もしくはアドバイス等を頂けると嬉しいです。

プログラムのソースコード

python
1# requires pyjwt (https://pyjwt.readthedocs.io/en/latest/)
2# pip install pyjwt
3
4
5import datetime
6import jwt
7
8
9secret = """-----BEGIN PRIVATE KEY-----
10ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123
11-----END PRIVATE KEY-----"""
12keyId = "0123456789"
13teamId = "9876543210"
14alg = 'ES256'
15
16time_now = datetime.datetime.now()
17time_expired = datetime.datetime.now() + datetime.timedelta(hours=12)
18
19headers = {
20	"alg": alg,
21	"kid": keyId
22}
23
24payload = {
25	"iss": teamId,
26	"exp": int(time_expired.strftime("%s")),
27	"iat": int(time_now.strftime("%s"))
28}
29
30
31if __name__ == "__main__":
32	"""Create an auth token"""
33token = jwt.encode(payload, secret, algorithm=alg, headers=headers)
34
35	print "----TOKEN----"
36	print token
37
38	print "----CURL----"
39	print "curl -v -H 'Authorization: Bearer %s' \"https://api.music.apple.com/v1/catalog/us/artists/36954\" " % (token)
40

エラーコード


Traceback (most recent call last):
  File "music_token.py", line 33, in <module>
    token = jwt.encode(payload, secret, algorithm=alg, headers=headers)
  File "/Users/shohei/anaconda2/lib/python2.7/site-packages/jwt/api_jwt.py", line 55, in encode
    json_payload, key, algorithm, headers, json_encoder
  File "/Users/shohei/anaconda2/lib/python2.7/site-packages/jwt/api_jws.py", line 104, in encode
    key = alg_obj.prepare_key(key)
  File "/Users/shohei/anaconda2/lib/python2.7/site-packages/jwt/algorithms.py", line 351, in prepare_key
    key = load_pem_private_key(key, password=None, backend=default_backend())
  File "/Users/shohei/anaconda2/lib/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 "/Users/shohei/anaconda2/lib/python2.7/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1015, in load_pem_private_key
    password,
  File "/Users/shohei/anaconda2/lib/python2.7/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1234, in _load_key
    self._handle_key_loading_error()
  File "/Users/shohei/anaconda2/lib/python2.7/site-packages/cryptography/hazmat/backends/openssl/backend.py", line 1292, in _handle_key_loading_error
    raise ValueError("Could not deserialize key data.")
ValueError: Could not deserialize key data.