Help getting started with V4

Hello All,

Have been developing a payment module for old V3 , came to a stop becuase of need to make a deposit/ wallet solution. Then Gordon suggested to use V4 for the Job.

Now I break my head to find answers about the new stuff exist in v4 , such as ec_receipt instead of payment , allocation , prodcut features and such. I have also read that the new system allow transaction or use of receipt for one time payment instead of the shoping cart or better yet independent of the shoping cart.

I have no clue where to start and after doing alot of searches with no answer I am posting this.

what are allocation types and how do I create them ?

How do I use ec_customer to track balance of customer , i.e. customer but credits with credit card , and then can use the credits to buy gifts for himself or others , or use the credits for other actitivities on the site for example each post cost X credits , each reply reward Y credits.

If some one can please just point me to the direction of where to begin.

thanks in advance ,
Yosi.