There is always a few hunters (i am using the word loosely) that travel with out having the means to pay for their hunt. (animal trophy fees and daily fees)
In the 80's I had one such person travel with us on 2 different hunts to Alaska. They were broke when they left the house, did not have the money to buy a soda or meal on the drive up to Alaska or the return trip. (so they talk a good story, however they come up short)
A few years back while in a hunting camp a PH was telling the story of a Hunter in camp who had pre-paid their daily fees, however no trophy fees were paid in advance. However the client did not have the money to take care of any trophy fees if he was successful, what the PH did was called home base and had a charter come and pick up the client to return the hunter to the nearest town and drop him off. The PH was was not aware of what happen to the individual after he left camp. However the charter company demanded payment for the flight and the hunter was able to use his credit card to make that payment or would have went to jail.
A different year; Another PH in another camp was have a great safari with an American client and the client shot more Trophy animals than expected. (heck i did that last year) When the time to settle the bill came at the end of the safari, the client was short the money to pay for the Sable he had taken. (the Sable was not on the hunter initial trophy list) The client returned to the states with the understanding that the trophy fees for the sable needed to be addressed when he returned home. You guessed it the client never came through and all the trophy's taken were held.
I like other here have indicated try to have a majority of the Trophy fees paid prior to going or held by the booking agent. I have also gone over my spending limit while on Safari, and what i anticipated my safari expenses to be. The two time that this has taken place, i have paid the balance with a few weeks after returning home. Both times, i could have paid the final Safari charges in the field, however, i would not have had any money left for tips for the PH and crew. Both times, we decided (group discussion) the tips for the staff and PH were the 1st order and that i could make the final payment when i returned home.