be able to upgrade / downgrade a plan

[AbhiAgarwal]

https://stripe.com/docs/subscriptions/upgrading-downgrading

can probably try on a demo account how it works. not too sure what it does when you change a plan... will have to look into it more carefully

[AbhiAgarwal]

the price changes are handled by stripe and not us. should probably move the current price calculations to stripe as well just to be on the safe side

[AbhiAgarwal]

params := &stripe.SubParams{
  Plan: "pro-monthly",
}
subscription, err := sub.Update("sub_49ty4767H20z6a", params)

upgrading a plan:

• you pay extra money for the rest of the month.

downgrading a plan:

• you get credited towards next months plan. so you pay less next month.