Estimate Vendor Credit Usage
Estimate the usage of vendor credits on an invoice of a given amount
Bearer authentication of the form Bearer <token>, where token is your auth token.
List of vendor credit IDs to include in the calculation. If not provided, all applicable vendor credits will be included, while an empty list will not include ANY vendor credits. This is useful for recalculating vendor credit usage on invoices that have a fixed list of applied vendor credits (e.g. a SCHEDULED or PENDING invoice).