Gaming Coins On The Facebook Application Game "happy Harvest", How Do You Get Farmer Coins?

On the facebook application game "happy harvest", how do you get farmer coins? - gaming coins

I want to buy half wolf, but they cost 4 pieces of farmers and I can not win the currencies of the farmers. Is there a way to convert currencies into play in the currencies of the farmers? If you can reach a certain level to earn coins for the farmers? and supporting farmers in their personal money to spend to make progress in the game? Please help me:]