The bottom line here is, you need to clarify at the time of booking what currency your unpaid bills will be settled in. If you booked a hunt last year and plan to take it this year, the need for currency clarification is even greater. This is particularly true in French Africa where local currencies are closely linked to the Euro, but outfitters anywhere in the world where the Euro is important may try to play a last-minute currency trick on you - unless you have all this ironed out ahead of time, preferably in a signed agreement. Canadian outfitters, too, may try to bellyache you into an extra payment this coming year.
We've told you before we are working on a Standardized Hunting Contract that we plan to offer to hunting clients. An agreement on currency is one of the matters we intend to incorporate in this contract. Until this contract is ready, do your own negotiating. Demand, in writing, that your outfitter spell out what currency you are doing business in for all of the services involved in providing your hunt.