1. Go to Settings module
2. Select SMS Templates options from settings menu
3. Add Event i.e. "Amount Receivable Due Cron Job" along with the Days
4. Days will indicate that how many days before the sms should be delivered
5. Enter the sms template in SMS Text field.
6. SMS Template - "Dear {CustomerName} your payment of {PayableAmt} due on {PaymentDate}. Please pay on time to avoid penalty thanks.- {companyName}"
7. Maximum 160 characters are allowed in the template
8. Save the details