How to use the SSO functionality when a button is clicked in Adobe Form?

I have an offline interactive form - when the user clicks on a SUBMIT to SAP button, it asks for user id and password.

However he user does not have a password to log into SAP directly - he will be logging in via Single Sign On.

Can you please advise on how to achive this functionality?

1. Click on a SUBMIT to SAP button on the Adobe Form

2. Take this info and get the Single Sign On token from SAP portal

3. Use this ticket/token and log into SAP ECC or validate this info within SAP ( for this 3rd step - probably use function module SUSR_CHECK_LOGON_DATA?)

Thanks