Hi Deepak,

In Salesforce Access token is its security token.

To get the security token for your Salesforce account

1. In the mailbox for the email address associated with the Salesforce account to be used by the Coveo connector, look for the latest email message received from support@salesforce.com with the subject: salesforce.com security token confirmation.
2. If you cannot find the latest email with a security token, reset the security token:
   • Log in to Salesforce using the Salesforce account to be used by the Coveo connector.
   • In the User Menu, select Setup.
   • In the menu on the left, under Personal Setup, expand My Personal Information, and then click Reset My Security Token.
   • Follow onscreen instructions.
3. A new email message will be sent. Open the message, and then copy the Security Token value.