beastboy_code

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[zinc hazel]

I run this function when the user has already paid for the old product, and now we need to switch them to a new product - so we can charge / refund them appropriately and then ship the product to them

So this is assuming they've paid already - so we can directly refund them or charge them the difference

[worn solstice]

Good question, looking in to how you can do this.

[zinc hazel]

thank you!

[worn solstice]

I think what you will want to do is specify proration_date as the beginning of the subscription's current cycle. I think that would mean we would calculate prorations as if the new price had been the subscription's price for the entire cycle https://docs.stripe.com/api/subscriptions/update#update_subscription-proration_date

[zinc hazel]

but I already do that with current_period_start

[worn solstice]

Whoops sorry, I did not look it over that closely. What does the invoice look like when you run that now?

[zinc hazel]

When I run this, it immediately charges the customer for the new product

[worn solstice]

Oh so the calculated amount is correct, but you want the update to be delayed until after the payment has been made?

[zinc hazel]

yes exactly

[worn solstice]

Gotche, then you should just need to add payment_behavior: 'pending_if_incomplete', to your call (I did check if it was in your original code this time)
https://docs.stripe.com/billing/subscriptions/pending-updates