Add service Pricing and Coupons feature

[alariva]

This would allow businesses to put a pricing to services generate discount coupons on them.

[fexploit]

Great feature.

[JVitorst]

Hello, any prediction of when can this functionality come?

[alariva]

Hi @JVitorst , unfortunately I'm currently not available to work on new features for this project. However, any PR or even research that could boost the implementation is welcome.