We’ve introduced a new field, is_payable_now, on changed_resources.created_invoices. The created_invoices field represents the list of invoices that will be generated as part of a pending subscription change or when previewing changes with the Include-Changed-Resources header. The new is_payable_now field on invoices represent ready-to-pay invoices containing only in-advance fixed fees. You can use this field to determine which invoices should be paid to enable access to a subscription change (eg. plan upgrade).

When it applies:

changed_resources (and thus created_invoices) are only returned

• When the explicit Include-Changed-Resources header is passed in a Subscription API request
• When calling the Pending Subscription Changes APIs