Mass update lookups in Zoho CRM using custom function

gistfile1.txt

void update_vendor_lookup (int finance_equity_id)
 finance_equity_obj = zoho.crm.getRecordById("CustomModule4", finance_equity_id);
 
 lender_string = finance_equity_obj.get("Lender");
 lender_id = 0;
 if (lender_string.contains("Adelaide")){
  //figure out appropriate lookup value based on picklist
  lender_id = 1002375000002270019;
 }
 
 //update lookup
 if (lender_id != 0){
  finance_equity_obj.put("Lender Name_ID", lender_id);
  finance_equity_id_str = toString(finance_equity_id);
  updateResp = zoho.crm.updateRecord("CustomModule4", finance_equity_id_str, finance_equity_obj);
 }