Transactional API

I am using Transactional API  to send the email. I defined the email template and in the email template I added the below Liquid to get the value dynamically from the code

{{ customer.passwordResetURL }}

and form the code

 message_data: {
        passwordResetURL:
          'http://abc/token=ce70db64258220',
       
      },

but in the email passing value is not getting resolved and make it is empty. Please let me know why it is getting the issue.
And moreover, I did not add the unsubscribe links in my email template but in the generated email it is showing the unsubscribe links. I don;t need the unsubscribe links so how i can hide this.
And when i send the email from code. Email is generating after some delay whereas it should genearte immediately because i don't want to be a delay as it is reset password email.  Need to deliver immediatly.