About Buyer Requests and Getting Paid

Hey guys,

I need some advise. I recently got a gig through the buyer requests feature. This gig was for more than the usual fiverr. How does the buyer pay for this gig if gigs are only $5? Would the buyer need to order 3 x $5 gigs (if the "gig" I made was worth $15), or how do you go about this?

If anybody has been in such a situation before your advise will be greatly appreciated.

Thanks in advance and regards.