Kahina

[vague magnet]

Should be possible using the proration_behavior parameter when making the update, yep: https://stripe.com/docs/billing/subscriptions/prorations

Have you make any attempts to update it as you need?

[idle beacon]

I tried with proration enabled, but the proration will be paid only in the next invoice

and I want the client to pay the proration immedialty without change the billing period

[vague magnet]

Can you share an example req_xxx ID of the changes you've tried?

https://support.stripe.com/questions/finding-the-id-for-an-api-request

[idle beacon]

req_t0qESwyNxnwPve

when I use billing_cycle_anchor => "now" my billing period is changed and the client pay the new invoice

but I want only to let him pay the difference of the added or updated items until the end of the current billing period

[sharp ibex]

Hey! Taking over for my colleague. Let me catch up.

[sharp ibex]

You can't achieve this using Stripe Subscriptions APIs.
If you want to pay just the difference of the added or updated items then you need to create a separate Invoice for the customer and charge manually the Customer for that amount.
You can preview the proration and charge manually the customer for the corresponding amount:
https://stripe.com/docs/billing/subscriptions/prorations#preview-proration
However, for the next invoice you need to discount the customer for that paid amount.