Harvest is a popular tool for tracking time, sending invoices and more. With this integration you can use Projectplace to organise your teamwork and Harvest to track the time and invoice your customers.
When you start working on a card a corresponding task is created in Harvest and you can then use Harvest's apps to report time. When you've competed your project in Projectplace, send the Invoice to your customer from Harvest.
To set this up for your team, do the following:
Sign up for your first project and invite your team for free.