How to use curl commands in multiple web login

The login process is completed through a three-step process:

1. Enter user name and password

   curl --user username:passwd --cookie-jar ./file_a website/account/login
   
   

2. Authorise in next page

   curl --cookie ./file_a website/account/index 
   
   

3. Approve via time duration needed

   curl --cookie ./file_a website/account/approve 
   
   

I used the above curl commands through a shell script, but it is not working.

I am sure in the third stage I have to mention the time-duration I am requesting for access license. Two options are available: 60 minutes and 1 hour.

Can anyone help me complete the work?