I used to use Xero once you put the number and street it will have the options of choosing the right address, I think you need to work on this. For example, if I have to fill up the postcode for the particular suburb, I need to google the postcode and enter manually. Which is time consuming. 
Once we put the number and street, the system should be able to suggest address and if we click the right one it should fill automatic suburb, postcode and state. Please explain?