Adding Purchasable Items

I have a work in progress project i intend releasing on Steam very soon.

My question is how can i add add-ons that will help the players?

For example:
If a player wants to build a house or have a certain animal, they need say 50 diamonds, but thry only have 10.
How can i give them the option to buy extra diamonds and it will add to their game?

This is a pc game and NOT a mobile game

 

Like nearly all platforms, Steam offers in-app purchases via their Steam Inventory:
https://partner.steamgames.com/doc/features/microtransactions/implementation

You will be looking at many man-hours of trial and error to understand and follow their implementation guide. My asset (Simple IAP System) has integrated that - it works.

 

Does your asset apply to PC games?

 

It does, as mentioned above. It also supports PayPal or Xsolla (local payments) on platforms that do not have their own store system.

 

In the video of the software it mentions about other software needed to go with simple iap, but i missed it as couldnt understand. Can you possibly write what other software/assets are needed please

 

Not sure what video you mean. The getting started video just shows Unity IAP, which is a requirement and free.