Japanese ODA agencies budget 10% for donations. Their main interest is making sure that these donations go to the politicians who can actually deliver on removing roadblocks to their aid delivery rather than chancers who try it on and never deliver. Benazir Bhutto’s husband was Mr. 10% when she was first prime minister. He was a net plus to the country according to The Economist Magazine article of say 20 years ago because investors only had to pay him rather than dozens of petty bureaucrats, each wanting a taste. These payments are lawful under the laws of Western countries because they are facilitation payments. They are not bribes because the foreign company is only paying the politician or bureaucrat to do what is his duty to do in the first place rather than stall the process in the hope of a bribe.
From The Dictator’s Handbook.