You can now set a deposit policy at a property level which will trigger Resly to attach the deposit due date to each reservation. You can also use the new {{DEPOSIT_DUE}} and {{DEPOSIT_AMOUNT}} merge fields in your guest communication templates. 

Settings > General > Invoice 

The date and amount will show in the reservation overview. 

Deposits will show in your dashboard under the Finance > Deposit tab. 

You can generate a deposits due report by clicking the print icon.