In the case of a successful non-guaranteed contest, the client has to make two payment: when launching the contest and when choosing a winner.
We attach the invoices to the e-mails that we send to confirm these two moments: the launch of the contest and the choice of the winner.
In the case of a guaranteed contest, there is only one payment to be made. The invoice will then be attached to the e-mail confirming the start of the contest.