MikeMike is correct about the best way to handle shakedowns....except that it's not true that no one ever posts about how to avoid paying. I've done it myself repeatedly, here and elsewhere, and so have others. Anyone who cares can find what others have done and work out their own approach.
The problem is that most people don't care. Some actually like to puff themselves up by bragging about paying bribes (like one recent poster whose bucket list apparently included paying a bribe, and got so excited when he managed to check this off the list that he posted at length about it). The fact that I personally view this as pathetic doesn't alter the fact that people continue to do it.
Keep fighting the good fight!