Hi,
I am using APEX19.1, DB 12c hosted on AWS.
I am trying to integrate SLACK with my application.
I created an app in SLACK to access the web-apis.
I am able to successfully post chats using Incoming web-hooks.
I am also able to GET/POST chats using my OAUTH Access Token generated when I created the app in my Slack workspace.

Now, I want to access this token by user logging in.
According to Slack docs, steps to authorize are.
1. POST to https://slack.com/oauth/authorize using my client _id and REDIRECT_URI
2. This will generate a code along with the redirect URI
3. Use the code is step 2 and POST to https://slack.com/api/oauth.access with client_id and client_secret as param
4. This will generate the Access_token
I am kind of stuck in step 3. How do I read the code generated in step2?
I created a sample page with a static region with code as
<a href="https://slack.com/oauth/v2/authorize?user_scope=identity.basic&client_id=<my_client_id>&redirect_uri=<Redirect_URL>> click </a>
This successfully takes me to Slack Login and after login I am redirected to my app-page. with the URL containing code part
But not able to read the code and get the token.
How do I solve this?
Is there any work-around for this?
Please suggest.
Thanks,
Veerendra.