To get Access Token from Salesforce

URL – https://test.salesforce.com/services/oauth2/token or https://domain.my.salesforce.com/services/oauth2/token

Method – POST

Parameters:

username
password
client_id
client_secret
grant_type=password

To get client_id and client_secret, use the below link

https://www.infallibletechie.com/2018/05/how-to-create-connected-apps-in.html

From POSTMAN Client in Google Chrome

From SOAPUI

Resource – /services/oauth2/token