Login at X time to gumtree.com.au and bump ads script

Hi, I'm looking for someone to write a script of some form that logs into a website: [login to view URL], selects all the ads that are present on the account and "bumps" them all. This is an option to put the ad to the top, it does cost money but can be selected on the website with a saved credit card on the account and just a pay button can be selected then. No data is needed to be entered on the website just options selected to the final screen.