Why is prepaying the mission advised ?
Prepaying the mission avoids giving advance payments that you may never see again if the mission were to be cancelled or if the freelancer wasn't serious. This is equally important for the freelancer as this establishes a framework of trust between the two of you, and they can complete their work without worry.
Being left unpaid is one of freelancer's biggest sources of anxiety !
This prepayment system is not mandatory to begin a project, but the freelancer is notified whether the account has been prepaid or not, and thus can request for prepayment in order to begin working.
Of course, this may not be possible for long-term missions (larger sums) and for large accounts (differing payment policies).
In this case, don't hesitate to call us so that we can reassure the freelancer with whom you wish to work.