There are 12 Invoices (Fast Travel Points) on the Afghanistan map of Metal Gear Solid V: The Phantom Pain. When picking up an invoice you will unlock a fast travel point for its location. Most of the named places have one. The fast travel points look like orange loading zones. When you hide in a box and stay on the loading zone a truck will come and pick you up, then you can fast travel to any other place in Afghanistan where you've previously picked up an invoice.
They are also required to unlock two key items for the "Collector" trophy / achievement. You must find all invoices in Afghanistan and Africa. Finding all invoices in one area unlocks the "Master Certificate (Box)" key item. Finding all invoices in both areas unlocks the "Grand Master Certificate (Box)" key item.
Fastest way to get them is to ride from one place to the next with D-Horse.
Invoices Africa: http://www.youtube.com/watch?v=p6YQsTkjZY4
#1 – Afghanistan Central Base Camp – 0:05
#2 – Serak Power Plant – 0:28
#3 – Yakho Oboo Supply Outpost – 0:49
#4 – Lamar Khaate Palace – 1:09
#5 – Shago Village – 1:30
#6 – Wialo Village – 1:52
#7 – Eastern Communications Post – 2:14
#8 – Ghwandai Town – 2:35
#9 – Wakh Sind Barracks – 2:56
#10 – Sakhra Ee Village – 3:15
#11 – Smasei Fort – 3:34
#12 – Mountain Relay Base – 3:54
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Metal Gear Solid V: The Phantom Pain Trophies and Achievements:
Completed a mission using a Combat Unit staff member.
Completed all missions.
Completed all mission tasks.
Completed all missions with an S rank.
Completed a SIDE OP.
Completed all "Mine Clearing" SIDE OPS.
Completed all SIDE OPS.
Captured an outpost or guard post.
Captured all outposts and guard posts in Northern Kabul, Afghanistan.
Captured all outposts and guard posts in the Angola-Zaire Border Region.
Completed all key Dispatch Missions.
Played an "Infiltration" FOB mission.
Made D-Dog available for deployment.
Made Quiet available for deployment.
Raised bond with D-Horse to the maximum.
Man's Best Friend
Raised bond with D-Dog to the maximum.
Raised bond with Quiet to the maximum.
Fulton extracted an enemy soldier.
Interrogated an enemy soldier.
To The Rescue
Extracted a female prisoner.
Increased Mother Base staff to 50 or more personnel.
Increased Mother Base staff to 250 or more personnel.
Raised all Teams/Units to level 99.
Developed 50 or more development items.
Developed 100 or more development items.
Locked and Loaded
Developed 300 or more development items.
Constructed all available platforms for Mother Base.
Developed a nuclear weapon.
Disposed of a nuclear weapon.
Earned a total of 10,000,000 GMP or more.
Extracted all wild animal species.
Obtained all blueprints and key items.
Obtained all memento photos.
Obtained the codename "Hero."