Error: You cannot set the quantity for metered plans

[Kashoid23]

We have used Koudoku gem with BulletTrain.

We've faced the issue within creation Subscriptions with "metered usage" and "pricing over limits".
There is 'quantity' parameter that is sent from koudoku/app/concerns/koudoku/subscription.rb to Stripe.
Stripe doesn't support this parameter for the metered plans and the Subscription can not be created/updated.
Stripe returns error "You cannot set the quantity for metered plans".

Could you please remove every 'quantity' parameter from koudoku/app/concerns/koudoku/subscription.rb in bullet-train branch as it's useless