Apply no refund when downgrading a configurable option

[ZeroGravity]

I offer a service that doesn't give a refund when you downgrade the number of configurable options. Clients are aware of this. I can't find a setting that would disable WHMCS from generating a pro-rated refund when this happens. Is there a setting somewhere to turn the refund off or perhaps a hook that can conditionally disable the refund calculation.

Many Thanks!

[DennisHermannsen]

I don't know if this can be used with configurable options, but it's worth a try: https://developers.whmcs.com/hooks-reference/everything-else/#preupgradecheckout

[ZeroGravity]

Thanks @DennisHermannsen I'll take a look.