getting a 500 error when using google purchasing REST API

Question

I'm developing an android app that uses Google Play's new subscription feature. Part of my app consists of a web server that periodically checks the status of these subscriptions via an API call. It also cancels some of these subscriptions.

Google provides two REST APIs to accomplish this:

https://developers.google.com/android-publisher/v1/purchases/get

https://developers.google.com/android-publisher/v1/purchases/cancel

I can get the first one to work great, using OAuth. However when I try to cancel certain subscriptions, I get a 500 error with no details. Has anyone else experienced this? Am I using it incorrectly? I'm sure the OAuth is working because I can hit the first API. Here is my curl output, with some of my account data concealed:

curl -X POST 'https://www.googleapis.com/androidpublisher/v1/applications/com.ssd.mypkg/subscriptions/mysku/purchases/mypurchasetoken/cancel' -H 'Authorization: OAuth ya29.myoauth' -d '' -v
* About to connect() to www.googleapis.com port 443 (#0)
*   Trying 209.85.148.95... connected
* Connected to www.googleapis.com (209.85.148.95) port 443 (#0)
* SSLv3, TLS handshake, Client hello (1):
* SSLv3, TLS handshake, Server hello (2):
* SSLv3, TLS handshake, CERT (11):
* SSLv3, TLS handshake, Server finished (14):
* SSLv3, TLS handshake, Client key exchange (16):
* SSLv3, TLS change cipher, Client hello (1):
* SSLv3, TLS handshake, Finished (20):
* SSLv3, TLS change cipher, Client hello (1):
* SSLv3, TLS handshake, Finished (20):
* SSL connection using RC4-SHA
* Server certificate:
*    subject: C=US; ST=California; L=Mountain View; O=Google Inc; CN=*.googleapis.com
*    start date: 2012-06-14 06:42:53 GMT
*    expire date: 2013-06-07 19:43:27 GMT
*    subjectAltName: www.googleapis.com matched
*    issuer: C=US; O=Google Inc; CN=Google Internet Authority
*    SSL certificate verify ok.
> POST /androidpublisher/v1/applications/com.ssd.mypkg/subscriptions/mysku/purchases/mypurchasetoken/cancel HTTP/1.1
> User-Agent: curl/7.21.4 (universal-apple-darwin11.0) libcurl/7.21.4 OpenSSL/0.9.8r zlib/1.2.5
> Host: www.googleapis.com
> Accept: */*
> Authorization: OAuth ya29.myoauth
> Content-Length: 0
> Content-Type: application/x-www-form-urlencoded
> 
< HTTP/1.1 500 Internal Server Error
< Content-Type: application/json; charset=UTF-8
< Date: Fri, 06 Jul 2012 15:23:10 GMT
< Expires: Fri, 06 Jul 2012 15:23:10 GMT
< Cache-Control: private, max-age=0
< X-Content-Type-Options: nosniff
< X-Frame-Options: SAMEORIGIN
< X-XSS-Protection: 1; mode=block
< Server: GSE
< Transfer-Encoding: chunked
< 
{
 "error": {
  "code": 500,
  "message": null
 }
}
* Connection #0 to host www.googleapis.com left intact
* Closing connection #0
* SSLv3, TLS alert, Client hello (1):

Answer 1

I can confirm having exactly the same issue. getting details works perfecty but canceling fails. I am using the Google API for java classes, so I think that this is a general issue we should post as a bug to google.

Here is the response I receive from google server:

com.google.api.client.googleapis.json.GoogleJsonResponseException: 500 Internal Server Error
{
  "code" : 500,
  "message" : null
}

Answer 2

I am also encountering this error. My app is only published in beta-testing mode. Could that be the problem, I wonder?

In case it is relevant, I am using a modified version of googlesamples/android-play-publisher-api where I changed basic_list_apks to act as a subscription revoker, by modifying the service-call defining line to be like this:

service.purchases().subscriptions().revoke(packageName=package_name,
    subscriptionId=product_id,
    token=purchase_token)