Unable to retrieve access token using oAuth flow

[nock_0]

Hi Team,

I have created  a developer account and got the client id and client secret from that account. The account is approved by EBay

I am using the sandbox credentials now

I am calling the below API to get the auth code

https://auth.sandbox.ebay.com/oauth2/authorize?client_id=xxxxxxxxxxx&redirect_uri=https://xxxxxxxxxx...

Then calling the below passing the required values from postman like

grant_type as authorization_code,

code,

redirect_url
Authorization header has Base64encoded client_id:client_secret

https://api.sandbox.ebay.com/identity/v1/oauth2/token

But I am getting the below error
{
"error":"invalid grant",
"error_description":"The provided authorization grant code is invalid or issued to another client"

}

When we use the grant_type as client_credentials, we are receiving the token

Please let me know what needs to be done to get the access and refresh token

Thanks

[developer_support@ebay]

Hi @nock_0 

The authorization code returned by eBay is URL-encoded. This value must be URL-encoded when you pass the value in the code parameter of the authorization code grant request. However, if the method you use to make the request URL-encodes the values you pass, then you must URL-decode the authorization code before using it the authorization code grant request.

cURL code snippet for the step Exchanging the authorization code for a User access token:

curl --location 'https://api.ebay.com/identity/v1/oauth2/token' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--header 'Authorization: Basic B64-encoded-oauth-credentials' \
--data-urlencode 'grant_type=authorization_code' \
--data-urlencode 'redirect_uri=RuName-value' \
--data-urlencode 'code= authorization code decoded/encoded value(as per the method you use)'