BSC smart contract integration in Unity 3d

We are looking for someone with deep knowledge on the topic to give me a rough estimate on how much it's going to cost to create a smart contract from either scratch or from a verified copy that will serve as a currency distributor inside the game on NPC kills and other such activities AND create this integration in a sort of blueprint type of product which can be plugged and played inside unity 3d much like the link: https://assetstore.unity.com/packages/tools/utilities/blockchain-sdk-by-enjin-124133 . Please provide relevant experience in your proposal as this is a very serious project and we are looking for a reliable candidate to complete it provide his expertise and professional insight on the project.