Invalid Grant Parameter

When I run the code:

CLIENT_ID="amzn1.application-oa2-client.2ce85ab0db2d4e9..."
CLIENT_SECRET="4247e7121f974bd0dc964d99e3dfa445b8572e..."
CODE="ANudVcrBPTyYrgKMHhtu"
GRANT_TYPE="authorization_code"
REDIRECT_URI="https://localhost:9745/authresponse"

curl -X POST --data "grant_type=${GRANT_TYPE}&code=${CODE}&client_id=${CLIENT_ID}&client_secret=${CLIENT_SECRET}&redirect_uri=${REDIRECT_URI}" https://api.amazon.com/auth/o2/token

i get the following error: {"error_description":"The request has an invalid grant parameter : code","error":"invalid_grant"} can anyone help me?

[NilSkilz]

Just to document my process somewhat…

The Amazon UI has changed a fair bit when creating the ‘device’. But it’s easy enough to muddle through that part. I used this page: https://sakirtemel.github.io/MMM-alexa/ to generate the ‘Code’. You need to add https://sakirtemel.github.io/MMM-alexa/ to the list of Redirect URLs for your device in the AVS product.

Once I had the ‘Code’ I used a REST console in Chrome (https://chrome.google.com/webstore/detail/advanced-rest-client/hgmloofddffdnphfgcellkdfbfbjeloo)

The url: https://api.amazon.com/auth/o2/token Select POST, Data Form then add your parameters for: client_id client_secret code grant_type redirect_uri

I discovered two things at this point.

1. The ‘Code’ generated is linked to the redirect_uri - so it needs to be the same one, in this case https://sakirtemel.github.io/MMM-alexa/ (Use this as it’s url encoded: https%3A%2F%2Fsakirtemel.github.io%2FMMM-alexa%2F)
2. The code is single use, so if something goes wrong and it doesn’t work, you’ll need to generate a new code to try again.

From that I got the refresh_token.

I have to say, I’ve not got it working properly yet - but I haven’t had time to debug what’s going on (could be mic issue etc). So let me know if anyone does all this and gets it to work!

On 23 Aug 2017, at 12:49, Dolan [e-mail] wrote:

Thanks @NilSkilz https://github.com/nilskilz I will update the guide to make it more clear

Did the Alexa helper website not help at all?

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/dolanmiu/MMM-awesome-alexa/issues/14#issuecomment-324304920, or mute the thread https://github.com/notifications/unsubscribe-auth/ADTmPbmDwSwTrwqwT1af_hKQ6drJ-o7Nks5sbBHWgaJpZM4Oifkq.

[NilSkilz]

In case anyone comes across this. I managed to get it working. One thing to note is that the ‘code’ you receive from Amazon expires when you try to use it, whether you receive back an access token or not. Also, the redirect_uri must be the same as the one you used to grant the initial code.