Let me welcome you ladies and gentleman. 

I'm developing a program that allows to upload photos to Picasa. Since 
serveral months the program is not working (and I am not surprised by this) 
The old authorization API has been shutdown, thus I'm moving my code to 
adopt to OAuth 2.0 and I'm stucked up a bit. 

So far I've been using GoogleData to access Picasa, and since that this API 
has not been replaced by anything new (according to this summary: (
https://developers.google.com/gdata/docs/directory  =>  GData version is 
still live. No replacement API) I should be using this API still. 

The problem is that I need to change the way my code gets authenticated and 
authorized to access the APIs that change data. I can still access the APIs 
in read-only mode - when I do not change anything, but read. I came across 
a short document which specifies several steps: 
https://developers.google.com/picasa-web/docs/2.0/developers_guide_protocol

I have managed successfully to  reach the point nr 5 - I received google 
access token that should be attached to service requests. 

*And now the question: How to attach this access token to requests ? *
There are two options for this: query string parameter or header value of 
HTTP requests. Since that I do not perform HTTP calls directly, but use the 
GData .Net libraries, I do not know whether should I do this is a generic 
way by intercepting the http runtime of my application and modify (add) 
these values ? or is there any API exposed by Google Data that should be 
used to achieve this ? 

I thought of using:

PicasaService pSerice;
...
...
var credential = GetGoogleAccessToken().Result;
String authenticationToken = credential.Token.AccessToken;
pSerice.SetAuthenticationToken(authenticationToken);

but I receive now http 403 (previously it was 404, before I started to 
change things) 

Any suggestions on how to attach (in preffered way) Access token to the 
service calls (that are invoked under the hood when using the library 
calls) ? 

Best regards, 
Przekolo. 




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