Create invoice

documented

Create a new invoice.

POST /invoicesAccountingno implementation yet0 runs

Input

site_id

Sage X-Site ID

site-abc123

contact_id*

Customer contact ID

CUST-001

date*

Invoice date (YYYY-MM-DD)

2026-02-18

due_date

Invoice due date (YYYY-MM-DD)

2026-03-18

invoice_number

Invoice number

INV-2026-0001

reference

Invoice reference

PO-1234

description*

Line item description

Consulting services

ledger_account_id*

Ledger account ID for line item

4000

quantity*

Line item quantity

unit_amount*

Line item unit amount

100.00

tax_rate_id

Tax rate ID

TAX-01

Calls Sage as you (your API key is your account); keychains.dev holds the credentials.