Zoho Sign API - How do I get action ID for actions?

Zoho Sign API - How do I get action ID for actions?

I have a template document. I need to create a document from the template and send it to the customer.

The api requires an action section for each recipient with action_id. 

How do I get this action_id? 

I need to add the recipients dynamically since each document created is for different customers.
 
        $data_string .= '"actions": [';
$data_string .= '{';
        $data_string .= '"action_id": "",';
        $data_string .= '"action_type": "SIGN",';
        $data_string .= '"recipient_name": "' . $recipient_name . '",';
        $data_string .= '"role": "Customer",';
        $data_string .= '"recipient_email": "' . $recipient_email . '",';
        $data_string .= '"recipient_phonenumber": "",';
        $data_string .= '"recipient_countrycode": "",';
        $data_string .= '"private_notes": "",';
        $data_string .= '"verify_recipient": false,';
        $data_string .= '"verification_type": "EMAIL"';
        $data_string .= '}';
$data_string .= '],';