You can buy UrbanPro coins on creating your Tutor profile on UrbanPro. Just follow the instructions and you will land up on a page which asks you to ‘Upgrade to Premium Membership’. You can select a suitable premium plan that best suits your requirement. Each of these premium plans offers a specific number of coins, upgrade as per your requirements.
In case, if you have exhausted all the coins before the expiry of your premium membership, you can buy extra coins.
The validity of UrbanPro Coins is dependent on the package that you have purchased.
For ex: Your Silver membership package has 3-month validity, which means that the Coins, if unspent by end of that duration, will expire along with a premium membership.
So please do ensure that you spend all your Coins before the expiry date.