Steps in Postman

Follow the steps to Create an OAuth2 Application: make sure you copy the client_id, secret, redirect URI, and scopes (you will need them in the following steps)
Go to your Postman account > paste the Factorial credentials endpoint URL > select Authorization > OAuth 2.0

Auth URL:
- Production: https://api.factorialhr.com/oauth/authorize
- Demo https://api.eu2.demo.factorial.dev/oauth/authorize
Access Token URL:
- Production https://api.factorialhr.com/oauth/token
- Demo https://api.eu2.demo.factorial.dev/oauth/token
Callback URL: paste the redirect URI from step 1.
Client ID: paste the redirect URI from step 1.
Client secret: paste the redirect URI value from step 1.
Scope: paste the scopes value from step 1.