prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Twitter asks for authorization even though I've already authorized Gittip
  As of #1369 Twitter is now asking me to authorize Giitip even though I've already done so.
  
  ![screen shot 2014-02-26 at 4 45 45 pm](https://f.cloud.github.com/assets/688886/2276800/fac5f68c-9f37-11e3-9dcc-5c77d35c6aa5.png)
  
  <bountysource-plugin>
  
  ---
  
  Want to back this issue? **[Place a bounty on it!](https://www.bountysource.com/issues/1428788-twitter-asks-for-authorization-even-though-i-ve-already-authorized-gittip?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github).
  </bountysource-plugin>
  
  Twitter asks for authorization even though I've already authorized Gittip
  As of #1369 Twitter is now asking me to authorize Giitip even though I've already done so.
  
  ![screen shot 2014-02-26 at 4 45 45 pm](https://f.cloud.github.com/assets/688886/2276800/fac5f68c-9f37-11e3-9dcc-5c77d35c6aa5.png)
  
  <bountysource-plugin>
  
  ---
  
  Want to back this issue? **[Place a bounty on it!](https://www.bountysource.com/issues/1428788-twitter-asks-for-authorization-even-though-i-ve-already-authorized-gittip?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github).
  </bountysource-plugin>
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `gratipay/elsewhere/twitter.py`
  Content:
  ```
  1 from __future__ import absolute_import, division, print_function, unicode_literals
  2 
  3 from gratipay.elsewhere import PlatformOAuth1
  4 from gratipay.elsewhere._extractors import key, not_available
  5 
  6 
  7 class Twitter(PlatformOAuth1):
  8 
  9     # Platform attributes
  10     name = 'twitter'
  11     display_name = 'Twitter'
  12     account_url = 'https://twitter.com/{user_name}'
  13 
  14     # Auth attributes
  15     auth_url = 'https://api.twitter.com'
  16 
  17     # API attributes
  18     api_format = 'json'
  19     api_url = 'https://api.twitter.com/1.1'
  20     api_user_info_path = '/users/show.json?screen_name={user_name}'
  21     api_user_self_info_path = '/account/verify_credentials.json'
  22     ratelimit_headers_prefix = 'x-rate-limit-'
  23 
  24     # User info extractors
  25     x_user_id = key('id')
  26     x_user_name = key('screen_name')
  27     x_display_name = key('name')
  28     x_email = not_available
  29     x_avatar_url = key('profile_image_url_https',
  30                        clean=lambda v: v.replace('_normal.', '.'))
  31
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/gratipay/elsewhere/twitter.py b/gratipay/elsewhere/twitter.py
  --- a/gratipay/elsewhere/twitter.py
  +++ b/gratipay/elsewhere/twitter.py
  @@ -13,6 +13,7 @@
   
       # Auth attributes
       auth_url = 'https://api.twitter.com'
  +    authorize_path = '/oauth/authenticate'
   
       # API attributes
       api_format = 'json'
  
verification_info: {"golden_diff": "diff --git a/gratipay/elsewhere/twitter.py b/gratipay/elsewhere/twitter.py\n--- a/gratipay/elsewhere/twitter.py\n+++ b/gratipay/elsewhere/twitter.py\n@@ -13,6 +13,7 @@\n \n     # Auth attributes\n     auth_url = 'https://api.twitter.com'\n+    authorize_path = '/oauth/authenticate'\n \n     # API attributes\n     api_format = 'json'\n", "issue": "Twitter asks for authorization even though I've already authorized Gittip\nAs of #1369 Twitter is now asking me to authorize Giitip even though I've already done so.\n\n![screen shot 2014-02-26 at 4 45 45 pm](https://f.cloud.github.com/assets/688886/2276800/fac5f68c-9f37-11e3-9dcc-5c77d35c6aa5.png)\n\n<bountysource-plugin>\n\n---\n\nWant to back this issue? **[Place a bounty on it!](https://www.bountysource.com/issues/1428788-twitter-asks-for-authorization-even-though-i-ve-already-authorized-gittip?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github).\n</bountysource-plugin>\n\nTwitter asks for authorization even though I've already authorized Gittip\nAs of #1369 Twitter is now asking me to authorize Giitip even though I've already done so.\n\n![screen shot 2014-02-26 at 4 45 45 pm](https://f.cloud.github.com/assets/688886/2276800/fac5f68c-9f37-11e3-9dcc-5c77d35c6aa5.png)\n\n<bountysource-plugin>\n\n---\n\nWant to back this issue? **[Place a bounty on it!](https://www.bountysource.com/issues/1428788-twitter-asks-for-authorization-even-though-i-ve-already-authorized-gittip?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F85909&utm_medium=issues&utm_source=github).\n</bountysource-plugin>\n\n", "before_files": [{"content": "from __future__ import absolute_import, division, print_function, unicode_literals\n\nfrom gratipay.elsewhere import PlatformOAuth1\nfrom gratipay.elsewhere._extractors import key, not_available\n\n\nclass Twitter(PlatformOAuth1):\n\n    # Platform attributes\n    name = 'twitter'\n    display_name = 'Twitter'\n    account_url = 'https://twitter.com/{user_name}'\n\n    # Auth attributes\n    auth_url = 'https://api.twitter.com'\n\n    # API attributes\n    api_format = 'json'\n    api_url = 'https://api.twitter.com/1.1'\n    api_user_info_path = '/users/show.json?screen_name={user_name}'\n    api_user_self_info_path = '/account/verify_credentials.json'\n    ratelimit_headers_prefix = 'x-rate-limit-'\n\n    # User info extractors\n    x_user_id = key('id')\n    x_user_name = key('screen_name')\n    x_display_name = key('name')\n    x_email = not_available\n    x_avatar_url = key('profile_image_url_https',\n                       clean=lambda v: v.replace('_normal.', '.'))\n", "path": "gratipay/elsewhere/twitter.py"}], "after_files": [{"content": "from __future__ import absolute_import, division, print_function, unicode_literals\n\nfrom gratipay.elsewhere import PlatformOAuth1\nfrom gratipay.elsewhere._extractors import key, not_available\n\n\nclass Twitter(PlatformOAuth1):\n\n    # Platform attributes\n    name = 'twitter'\n    display_name = 'Twitter'\n    account_url = 'https://twitter.com/{user_name}'\n\n    # Auth attributes\n    auth_url = 'https://api.twitter.com'\n    authorize_path = '/oauth/authenticate'\n\n    # API attributes\n    api_format = 'json'\n    api_url = 'https://api.twitter.com/1.1'\n    api_user_info_path = '/users/show.json?screen_name={user_name}'\n    api_user_self_info_path = '/account/verify_credentials.json'\n    ratelimit_headers_prefix = 'x-rate-limit-'\n\n    # User info extractors\n    x_user_id = key('id')\n    x_user_name = key('screen_name')\n    x_display_name = key('name')\n    x_email = not_available\n    x_avatar_url = key('profile_image_url_https',\n                       clean=lambda v: v.replace('_normal.', '.'))\n", "path": "gratipay/elsewhere/twitter.py"}]}