{"openapi":"3.1.0","info":{"title":"POST /api/v1/contracts/{contract_id}/invoices","version":"1.0.0","description":"Manually draft an additional invoice"},"servers":[{"url":"https://api.ondayzero.com","description":"Production"}],"paths":{"/api/v1/contracts/{contract_id}/invoices":{"post":{"tags":["contracts"],"summary":"Manually draft an additional invoice","description":"Draft an additional (e.g. future-dated) invoice on the contract, outside the execution/period automation. Lines default to the contract's recurring (each-period) order lines when omitted. 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Branch on `code` (stable) rather than `message` (human-readable, may change).","required":["error","message","code"],"properties":{"error":{"type":"string","description":"Error category: `validation_error`, `unauthorized`, `forbidden`, `not_found`, `conflict`, `rate_limited`, `server_error`, or `service_unavailable`."},"message":{"type":"string","description":"Human-readable explanation, safe to show to end users."},"code":{"type":"string","description":"Stable machine-readable code in `CATEGORY_NNN` form (e.g. `NOT_FOUND_006`, `AUTH_010`, `GEN_002`)."},"request_id":{"type":"string","description":"Correlation id for support requests. Echoes the `x-request-id` request header when one was supplied."},"errors":{"type":"object","additionalProperties":{"type":"string"},"description":"Field-level validation messages keyed by field name. Present on 400/422 validation failures only."}}}},"securitySchemes":{"BearerAuth":{"type":"http","scheme":"bearer","bearerFormat":"API Token","description":"API token authentication. Format: `Bearer dz_...`"}}},"security":[{"BearerAuth":[]}]}