Create Supplementary Sales Invoice
POST/api/sales-invoices/:salesInvoice/supplementary
Bill an extra amount on this invoice's sales order — for under-billing such as a price adjustment or a missed charge — without touching the issued invoice. Adds a one-off revenue charge of amount to the order and creates a new invoice for exactly that charge, as a draft or issued straight away.
orders:writeGrant this scope to your token under Settings → Developer → Personal Access Tokens.
Body
description(string, required, up to 255 characters): what the invoice bills, e.g. "Price adjustment"; printed as the line descriptionamount(number, required, greater than 0): the amount to bill, in the order's currencyissue(boolean, optional, default false): issue the new invoice immediately
Returns 201 with the new invoice. Returns 422 when the invoice covers several orders (create it from the order instead) or the order cannot be invoiced.
Requires orders:write and sales_invoices.create.
Request
Responses
- 201
- 401
- 403
- 404
- 422
- 429
Created
Response Headers
Unauthenticated — the bearer token is missing, revoked, expired, or malformed. Never retry automatically; fix the credential. See the Errors guide.
Forbidden — the token lacks a required scope, the endpoint is not available to API tokens, or the user behind the token lacks the permission. A human must adjust the token scopes or user permissions; do not retry.
Not found — no record with the given identifier (or the route does not exist). Verify the ID before retrying.
Unprocessable Content
Response Headers
Rate limited — platform limit is 1,000 requests/min; individual tokens may carry lower limits. Honor the Retry-After header before retrying. See the Rate Limits guide.