Zoho Invoice - Need Deluge Coding Help

Zoho Invoice - Need Deluge Coding Help

Hello, 

I would like to write a code for calculating sales commissions after creation of each invoice.

I added a custom field for commission percent to CRM Contacts module and synced this module to Zoho Invoice. 
Custom field for commission percent : cf_commission_percent
Custom field for commission amount : cf_sales_commission
Formula : Sales Commission = Invoice Total*cf_commission_percent/100

My code is as follows but it is not working. Any help is appreciated.

customerID = invoice.get("customer_id");
subtotal= invoice.get("sub_total");
sales_commission= invoice.get("cf_sales_commission");
contactMap = List();
contactMap = zoho.invoice.getRecordById("Contacts",717534537,customerID);
contact = contactMap.get("contact");
commission_percent = contact.get("cf_commission_percent");
sales_commission = floor(subtotal * commission_percent/100);
updateparams = zoho.invoice.update("invoice", 717534537, sales_commission);
info updateparams;


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