Retrieve Zoho Subscription ID following getList function

Hello, I am creating a custom function which will update a customer's Zoho Subscription as inactive when their Zoho CRM account is made inactive.

I am using the subscriptions getList function as follows in order to retrieve all subscriptions:

allSubscriptions = zoho.subscriptions.getList("Customers", "694960175");

My next step is to find the subscription ID which matches the Account that was made inactive. Based on instructions at this article: https://www.zoho.com/deluge/help/subscription/fetch-records.html

From the article:

To fetch the record IDs from the response, use the following snippet:

var = <response_variable>.get("<module_name>"); 
// example for <module_name> is customers
for each var1 in var
{
info var1.toMap().get("<module_name>_id");
// example for <module_name>_id is customer_id
}

However, I'm getting null returned. Can you help me understand how to retrieve a specific subscription field value?