I'm having the same problem.
I did the following for a test account :
* download the PHP API library
* use developer token from production account
* get "native" client ID + client secret
* add client ID + client secret to API library
* run the "GetRefreshToken" file to get a refresh token
* add refresh token to API library
I managed to create a simple PHP app using these settings.
Then, my developer key was approved.
I got the "native" client ID + client secret for the production account as
well and generated a refresh token. I followed the same procedure I
followed with my test account.
Yet, I still keep getting the following error : An error has occurred: {
"error" : "invalid_grant" }
I repeated the process several times. I have no idea what could be wrong...
Op vrijdag 8 november 2013 15:19:56 UTC+1 schreef Anash P. Oommen (AdWords
API Team):
>
> Hi Naman,
>
> The problem is that invalid grant is a generic error that says your OAuth
> signup failed. It doesn't give any more details, and that is by design.
> That makes it all the more difficult to debug the issue.
>
> Let's start one step at a time. I'm sure you might have tried these steps
> before, but it would be nice if you could do this again from beginning and
> help me figure out at what stage the code fails:
>
> 1. Were you able to able to run the offline credentials application and
> generate a refresh token and access token?
> 2. Did you copy this refresh token to your ads.properties file and run a
> Java code example?
> 3. Could you double-check if you don't have any trailing spaces on the
> refresh token in the ads.properties?
> 4. When you run code example, does the refresh token belong to the
> customer pointed to by clientCustomerId, or its parent / ancestor MCC?
>
> Cheers,
> Anash P. Oommen,
> AdWords API Advisor.
>
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