Studying how to put In App Purchase into my Iphone games

Okay, So I am now studying how to put the In App Purchase in Iphone

should be easy right? WRONG!!!

itune connect setup:
step1: create the app in itune connect
step2: create the in app purchase item
- say if you have 3 in app purchase item, you need to create 3 with description and screenshot
step3: create a test user in itune connect for you to test the in app purchase


integrating inside unity:

Okay, after hours of googling, seem like there is no easy way to do it, you need to download the Unity plugin

three choice
1. U3DXT plugin ( it cost $100 in unity asset store)
- it is super easy to plugin, just very expensive

2. Prime31 plugin ( it cost $70 in unity asset store)
- it seem to be easy to plugin, but again it is very expensive

3. Soomla plugin (its free in unity asset store)
- it is free, but you need to update your unity to the latest version....
- also it is in C sharp, if you code your game in javascript you will have a lot of trouble

Okay, so i now need 1-2 hour to download the latest unity(1.3GB)

then i will update it back here

okay, I finished update my unity to the latest version

Soomla Unity plugin:
step1: download it inside the unity asset store
step2: import it into your project
step3: drag the 2 prefab , "CoreEvents", "StoreEvents" into your project

then i am stuck......let me google a while, okay I will try follow the below tutorial

well the tutorial is not useful, as I code my game in javascript, the soomla is in C sharp, i will have a lot of difficult time to understand the code