to use first signup using below URL from browser in my case host was host="http://127.0.0.1:8000"
{{host}}/accounts/sign_up/
Go to {{host}} from browser. Copy cookie of request header in my case Cookie: sessionid=wxf95gh7m19l69kmvtlo5vx94t8kq9to; csrftoken=U8amkeyUU20oQuwRKqfLmdicXccOkQDc6NjlRnsML2yatAXPmIT9sQPCYuOg2r1r
Now we are done open below postman collections and put in headers part and experiment with apis. "https://www.getpostman.com/collections/727eaf8d55ecc5d06dfa"