You can purchase Time-based Credit by submitting a Ticket and selecting Time-based Credit in the Type field. You must be logged in to submit a ticket, you can sign up here.
In the description, let us know the amount of requested hours. A member of our team will ask for further details for invoicing, and also what immediate tasks you need solving.
Here's our price per block of time for Time-based Credit.
If you require an invoice in Euros, please request this.