xFlo

[inland umbra]

Not sure what you mean by 'change the quantity'

Your customer selects the quantity they want on the payment page initiated by the table

Yes, they'd adjust quantity on the payment page (not on the table)

The portal? Sure they can manage the quantity if you wish: https://stripe.com/docs/api/customer_portal/configurations/create#create_portal_configuration-features-subscription_update-default_allowed_updates

Sure, in the Dashboard: https://dashboard.stripe.com/settings/billing/portal

np