How to setup connection with certificate to Sharepoint using ICS?

Summary:

How can I do an authorization request in my REST ADAPTER to get the correct JWT tokens?

For the POSTMAN request I first have to run a powershell command to call a script which request a token for https://login.microsoftonline.com/$TenantName/oauth2/token. 

This script also contains reference to a certificate. 

1. Where should I place this script in OIC?

2. How Can I do this in OIC, make the certificate part of my script?

3. How do I then make sure that my rest adapter will use the token gotten from the script?

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