diff --git a/AuthKey_JZC9L76TDT.p8 b/AuthKey_JZC9L76TDT.p8
index b74bd74..a421871 100644
--- a/AuthKey_JZC9L76TDT.p8
+++ b/AuthKey_JZC9L76TDT.p8
@@ -3,4 +3,4 @@ MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQgOzAYvVe2plgEO65I
 rzpfDiorOSshVWOZyYyYxKukiMOgCgYIKoZIzj0DAQehRANCAATr5XT5byC/B3CD
 3k5HZAVkcgnIpGIhLn/zcSoINnHpNoykKfNRcPAViyF5oPapP6dzdhzfXpPAschh
 eKfajgao
------END PRIVATE KEY-----
\ No newline at end of file
+-----END PRIVATE KEY-----
diff --git a/jwt_signed.txt b/jwt_signed.txt
index 8774798..32f91fb 100644
--- a/jwt_signed.txt
+++ b/jwt_signed.txt
@@ -1 +1 @@
-eyJhbGciOiJFUzI1NiIsImtpZCI6IkpaQzlMNzZURFQiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiI2OWE2ZGU4My0wMmYyLTQ3ZTMtZTA1My01YjhjN2MxMWE0ZDEiLCJpYXQiOjE3MDUzMjU5OTcsImV4cCI6MTcwNTMyOTI5NywiYXVkIjoiYXBwc3RvcmVjb25uZWN0LXYxIiwiYmlkIjoic3RheC5TbGFzaFBva2VyLm5vc2VibGVlZCJ9.Vr1p1t42RS6JC99USVHo1feS-43LeCGnBU464sa2fWFH-DaxAG8p6IeH3SfXoKAnN9UVJKF2ZOWkHypzJoFXSg
\ No newline at end of file
+eyJhbGciOiJFUzI1NiIsImtpZCI6IkpaQzlMNzZURFQiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiI2OWE2ZGU4My0wMmYyLTQ3ZTMtZTA1My01YjhjN2MxMWE0ZDEiLCJpYXQiOjE3MDUzMjk3MzIsImV4cCI6MTcwNTMzMzI3MiwiYXVkIjoiYXBwc3RvcmVjb25uZWN0LXYxIiwiYmlkIjoic3RheC5TbGFzaFBva2VyLm5vc2VibGVlZCJ9.qk7ncK1WBIZqLkFkEQkEknmd6TgpEdg5h7OflcFxc3VfE99wo6hQV33S4oXe-pw3Zyz2h3_uOlXY5spz3pl4nw
\ No newline at end of file
diff --git a/pokeranalytics_backend/settings.py b/pokeranalytics_backend/settings.py
index 9049cae..52cb0f6 100644
--- a/pokeranalytics_backend/settings.py
+++ b/pokeranalytics_backend/settings.py
@@ -22,7 +22,7 @@ BASE_DIR = Path(__file__).resolve().parent.parent
 
 # SECURITY WARNING: keep the secret key used in production secret!
 SECRET_KEY = 'django-insecure-v9l*b^t^2eqp877kdrt%5g#y=8$e%e^sa!65(1@t+rp@avwx+@'
-ASS_KEY_FILE = BASE_DIR / 'AuthKey_JZC9L76TDT.p8'
+ASS_KEY_FILE = BASE_DIR / 'AppleRootCA-G3.cer'
 
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
diff --git a/subscriptions/AppleRootCA-G3.cer b/subscriptions/AppleRootCA-G3.cer
new file mode 100644
index 0000000..228bfa3
Binary files /dev/null and b/subscriptions/AppleRootCA-G3.cer differ
diff --git a/subscriptions/views.py b/subscriptions/views.py
index aa76699..1eed61e 100644
--- a/subscriptions/views.py
+++ b/subscriptions/views.py
@@ -6,16 +6,24 @@ from django.conf import settings
 import json, jwt
 import base64
 
-import logging
-import logging.config
-
-logger = logging.getLogger("main")
+from OpenSSL.crypto import (
+  X509Store,
+  X509StoreContext,
+  X509StoreContextError,
+  load_certificate,
+  FILETYPE_ASN1,
+  FILETYPE_PEM
+)
 
 def index(request):
     return HttpResponse("Hello, world. You're at the subs index.")
 
 def test(request):
-    return HttpResponse("Test succeeded!")
+    KEY_FILE = settings.ASS_KEY_FILE
+
+    with open(KEY_FILE,'r') as key_file:
+        key = ''.join(key_file.readlines())
+    return HttpResponse(key)
 
 @csrf_exempt
 def app_store_webhook(request):
@@ -26,24 +34,51 @@ def app_store_webhook(request):
     signedPayload = fulljson['signedPayload']
 
 
-    content = signedPayload.split('.')[1]
-    jws_payload =  base64.b64decode(content)
-    data = json.loads(jws_payload.decode())
+    KEY_FILE = settings.ASS_KEY_FILE
 
+    with open(KEY_FILE,'r') as key_file:
+        key = ''.join(key_file.readlines())
 
-    #KEY_FILE = settings.ASS_KEY_FILE
+    decodedPayload = _decode_jws(token, algorithms=algorithms)
 
-    #with open(KEY_FILE,'r') as key_file:
-    #    key = ''.join(key_file.readlines())
 
-    #decodedPayload = jwt.decode(signedPayload, key, algorithms=['ES256'])
+    # decodedPayload = jwt.decode(signedPayload, key, algorithms=['ES256'])
 
     #print('hell yeah!' + str(key))
     #logger.debug('test getLogger' + str(key))
 
     notification = ASSNotification(
-        content=jws_payload,
+        content=decodedPayload,
     )
     notification.save()
 
     return JsonResponse({'status': 'success'})
+
+
+def _decode_jws(token, root_cert_path, algorithms):
+  try:
+    header = jwt.get_unverified_header(token)
+
+    # the first cert contains the public key used to sign the jwt
+    first_cert_data = header["x5c"][0]
+    first_cert_data = add_labels(first_cert_data)
+    first_cert = load_certificate(FILETYPE_PEM, first_cert_data)
+
+    # the other certs are an x5c (X.509 certificate chain)
+    chain_datas = header["x5c"][1:]
+    chain_datas = [add_labels(cd) for cd in chain_datas]
+    chain = [load_certificate(FILETYPE_PEM, cd) for cd in chain_datas]
+
+    public_key = first_cert.get_pubkey().to_cryptography_key()
+
+    store = X509Store()
+    store.add_cert(_get_root_cert(root_cert_path))
+    ctx = X509StoreContext(store=store, certificate=first_cert, chain=chain)
+    ctx.verify_certificate()
+
+    return jwt.decode(token, public_key, algorithms=algorithms)
+  except (ValueError, KeyError, jwt.exceptions.PyJWTError, X509StoreContextError) as err:
+    raise InvalidTokenError from err
+
+def add_labels(key: str) -> bytes:
+  return ("-----BEGIN CERTIFICATE-----\n" + key + "\n-----END CERTIFICATE-----").encode()
diff --git a/token_generator.py b/token_generator.py
index ccce487..e363d92 100644
--- a/token_generator.py
+++ b/token_generator.py
@@ -11,7 +11,7 @@ bid = 'stax.SlashPoker.nosebleed'
 # Define issue timestamp.
 issued_at_timestamp = int(dt.datetime.now().timestamp())
 # Define expiration timestamp. May not exceed 20 minutes from issue timestamp.
-expiration_timestamp = issued_at_timestamp + 55*60
+expiration_timestamp = issued_at_timestamp + 59*60
 
 # Define JWT headers.
 headers = dict()
@@ -43,7 +43,7 @@ key=key
 with open('jwt_signed.txt', 'w') as output:
      output.write(client_secret)
 
-# curl -X POST -v -H 'Authorization: Bearer eyJhbGciOiJFUzI1NiIsImtpZCI6IkpaQzlMNzZURFQiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiI2OWE2ZGU4My0wMmYyLTQ3ZTMtZTA1My01YjhjN2MxMWE0ZDEiLCJpYXQiOjE3MDUzMjIxMjUsImV4cCI6MTcwNTMyNTQyNSwiYXVkIjoiYXBwc3RvcmVjb25uZWN0LXYxIiwiYmlkIjoic3RheC5TbGFzaFBva2VyLm5vc2VibGVlZCJ9.dM2cM92BX7f4f8fuF72HRaOutK1POs6tQcVriXMQQIA_tA_HOayXYuTRt_cUc4HLqErkRj9NNiT0CV0ZJECqpQ' https://api.storekit-sandbox.itunes.apple.com/inApps/v1/notifications/test
+# curl -X POST -v -H 'Authorization: Bearer eyJhbGciOiJFUzI1NiIsImtpZCI6IkpaQzlMNzZURFQiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiI2OWE2ZGU4My0wMmYyLTQ3ZTMtZTA1My01YjhjN2MxMWE0ZDEiLCJpYXQiOjE3MDUzMjk3MzIsImV4cCI6MTcwNTMzMzI3MiwiYXVkIjoiYXBwc3RvcmVjb25uZWN0LXYxIiwiYmlkIjoic3RheC5TbGFzaFBva2VyLm5vc2VibGVlZCJ9.qk7ncK1WBIZqLkFkEQkEknmd6TgpEdg5h7OflcFxc3VfE99wo6hQV33S4oXe-pw3Zyz2h3_uOlXY5spz3pl4nw' https://api.storekit-sandbox.itunes.apple.com/inApps/v1/notifications/test
 # Usage, after run this code by python3
 # get token from `client_secret.txt` and replace to [signed token]
 # Remember expired time maximum is 20 minutes