ChargeQuantityProration

Collect the money a quantity change moved.

Source: packages/paykit/src/Billing/ChargeQuantityProration.binding.ts Kind: Binding · Product: Payments · Provides: Paykit.ChargeQuantityProration

Collect the money a quantity change moved.

SetQuantity records the proration and the key that owns it; this is the step that opens the provider invoice and records it. A positive due is collected, and the account’s quantity credits are spent against it first: the invoice opens for the net, so a reduction from an earlier period settles here instead of being paid out as cash (ADR 0042). A credit larger than the charge leaves a remainder for a later one; a credit that covers the charge fully records the application and opens no invoice.

Collecting a seat increase

const setQuantity = yield* Paykit.SetQuantity(account);
const { proration } = yield* setQuantity({
  feature: "seats",
  quantity: 8,
  dedupeKey: "seats:2026-11-06",
});
if (proration !== undefined && proration.due > 0) {
  yield* (yield* Paykit.ChargeQuantityProration(account))({
    prorationId: "seats:2026-11-06",
  });
}