How to manage addon product preventing multiple purchases ?

[Esi]

Hi all,

 

i'm finding some difficulties to understand how manage disponibility for some addon products. Every client from their clientarea can buy addon product to add them to their pricinpal services, but i need that every client can buy only onetime these addon products, prevent they buy more of them.

 

I have already checked this feature with whmcs, but there's idea to work on it till now. I have opened a request to this link https://requests.whmcs.com/topic/client-remove-an-addon-bought-times-ago

 

Is there someone have solved this kind of problem, integrating whmcs with some modules for example?

 

I hope that there are people interested to this my problem.

 

Thank you.

Regards