Salesforce Authentication Failing

Question

I am trying to use OAuth authentication to get the Salesforce Authentication Token, so I referred wiki docs, but after getting authorization code, when I make a Post request

Answer 1

TL:DR

For OAuth 2 tokens if you login...

• At login.salesforce.com use https://login.salesforce.com/services/oauth2/token
• At test.salesforce.com use https://test.salesforce.com/services/oauth2/token

Story:

1. I was following Salesforce "Set Up OAuth 2.0"
2. Credentials were correct (many character by character checks)

3. When I'd call curl https://login.salesforce.com/services/oauth2/token -d "...credentials..." it still failed with:

   {"error":"invalid_grant","error_description":"authentication failure"}

Solution:

Realized there are different OAuth environments when reading Digging Deeper into OAuth 2.0 in Salesforce specifically (emphasis added):

OAuth 2.0 Authentication Endpoints

OAuth endpoints are the URLs that you use to make OAuth authentication requests to Salesforce. When your application makes an authentication request, make sure you’re using the correct Salesforce OAuth endpoint. The primary endpoints are:

• Authorization—https://login.salesforce.com/services/oauth2/authorize
• Token—https://login.salesforce.com/services/oauth2/token
• Revoke—https://login.salesforce.com/services/oauth2/revoke (see Revoke OAuth Tokens for details on revoking access)

Instead of login.salesforce.com, customers can also use the My Domain, community, or test.salesforce.com (sandbox) domains in these endpoints.

Fix

Because I logged into my environment via test.salesforce.com switching to curl https://test.salesforce.com/services/oauth2/token -d "...credentials..." resulted in a "Congrats! (>^_^)> Give OAuth token response"