Send E-Invoice for Singapore | Staple AI

curl -X POST https://api.staple.io/v2/einvoice/ar/qid \
     -H "x-api-key: <apiKey>" \
     -H "Content-Type: application/json" \
     -d '{
  "Addon": "sg-standard",
  "Buyer": {
    "Address": {
      "City Name": "Singapore",
      "Country Code": "SG",
      "Postal Zone": "088541",
      "Street Name": "120 Tanjong Pagar Road"
    },
    "Email": "atharva@staple.io",
    "Name": "Northstar Commerce Pte. Ltd.",
    "Peppol Endpoint ID": "SGTST202623458Y",
    "Peppol Scheme ID": "0195",
    "Registration Number": "202623458Y",
    "Tax ID": "M90262345Y"
  },
  "Currency": "SGD",
  "Document Type": "Invoice",
  "Invoice Date": "2026-08-26",
  "Invoice Number": "TC-1A-01",
  "Line Items": [
    {
      "Description": "Consulting services",
      "Line Amount": 1500,
      "Line ID": "1",
      "Quantity": 1,
      "Tax Breakdown": [
        {
          "Tax Amount": 135,
          "Tax Category Code": "SR",
          "Tax Rate": 9,
          "Tax Scheme": "GST",
          "Taxable Amount": 1500
        }
      ],
      "Unit Amount": 1500,
      "Unit of Measure": "C62"
    }
  ],
  "PO Number": "PO-88213",
  "Payment": {
    "Due Date": "2026-09-15"
  },
  "Seller": {
    "Address": {
      "City Name": "Singapore",
      "Country Code": "SG",
      "Postal Zone": "068895",
      "Street Name": "71 Robinson Road"
    },
    "Email": "atharva@staple.io",
    "Name": "Meridian Crest Pte. Ltd.",
    "Peppol Endpoint ID": "SGTST202612344K",
    "Peppol Scheme ID": "0195",
    "Registration Number": "202612344K",
    "Tax ID": "M90261234K"
  },
  "Totals": {
    "Subtotal": 1500,
    "Sum of Line Amounts": 1500,
    "Tax Total": 135,
    "Total": 1635,
    "Total incl Tax": 1635
  },
  "Transaction Type": "Sales",
  "UUID": "fd2c31a5-45f2-41b5-aae3-e063e2efdc1b"
}'

Generate and send a Singapore e-invoice from ERP invoice JSON. This is the single entry point for AR/AP flows 1A, 2A, 2B, 3A and 3B — you POST the invoice JSON, and Staple maps it to PINT-SG UBL, runs it through the document-creation pipeline, and (depending on the flow) sends it over the Peppol network and/or submits the tax data to IRAS.

Send is asynchronous: a requestId is returned immediately. Track delivery/tax status by polling GET /v2/supernova/models/document/{requestId} (peppolSendStatus, irasTaxSubmissionStatus).

Flow selection

The exact flow is resolved from the destination query parameter plus Transaction Type and Addon in the payload:

`destination`	`Transaction Type`	`Addon`	Flow	Sends Peppol	Submits IRAS
`peppol_iras`	Sales	sg-standard	1A	✅	✅
`iras`	Sales	sg-standard	2A	—	✅
`iras`	Sales	sg-aggregated	2B	—	✅
`iras`	Purchases	sg-standard	3A	—	✅
`iras`	Purchases	sg-aggregated	3B	—	✅

Document Type

Document Type is Invoice (default when omitted) or Credit Note. A credit note additionally requires a Note and exactly one Document Reference (Number + Date) pointing at the original invoice. Credit notes are not supported on the sg-aggregated addon (Flows 2B and 3B).

Company & party rules

For Sales (AR) the Seller must be a registered Staple e-invoice company owned by your organisation; for Purchases (AP) it is the Buyer.
Seller and Buyer cannot be the same Peppol participant.
For aggregated flows the counterparty is a reserved literal — POS/STI (Flow 2B) or PCP (Flow 3B).

Use-case catalogue

Every combination the endpoint accepts, with the sample payload that exercises it:

Scenario	`destination`	Txn	Addon	Doc Type	Flow
Peppol standard invoice	`peppol_iras`	Sales	sg-standard	Invoice	1A
Peppol multi-tax invoice	`peppol_iras`	Sales	sg-standard	Invoice	1A
Peppol credit note	`peppol_iras`	Sales	sg-standard	Credit Note	1A
IRAS standard invoice	`iras`	Sales	sg-standard	Invoice	2A
IRAS foreign-currency invoice	`iras`	Sales	sg-standard	Invoice	2A
IRAS zero-rated sales	`iras`	Sales	sg-standard	Invoice	2A
IRAS sales credit note	`iras`	Sales	sg-standard	Credit Note	2A
Aggregated POS (single tax)	`iras`	Sales	sg-aggregated	Invoice	2B
Aggregated POS (multi tax)	`iras`	Sales	sg-aggregated	Invoice	2B
Aggregated STI (simplified)	`iras`	Sales	sg-aggregated	Invoice	2B
Purchase standard invoice	`iras`	Purchases	sg-standard	Invoice	3A
Purchase residual input tax	`iras`	Purchases	sg-standard	Invoice	3A
Purchase credit note	`iras`	Purchases	sg-standard	Credit Note	3A
Aggregated PCP (single tax)	`iras`	Purchases	sg-aggregated	Invoice	3B
Aggregated PCP (multi tax)	`iras`	Purchases	sg-aggregated	Invoice	3B
Aggregated PCP (residual)	`iras`	Purchases	sg-aggregated	Invoice	3B

Example naming ↔ flow mapping

The request examples use the sg-test-pack naming (1A-01, 2B-03, …). Each prefix maps to the flow convention as follows:

Example prefix	Scenario group	Flow
`1A-##-peppol-*`	AR — Peppol + IRAS send	Flow 1A (`destination=peppol_iras`)
`1A-IRAS-##-*`	AR — IRAS-only, standard	Flow 2A (AR · `iras` · sg-standard)
`2A-##-sales-*`	AR — sales, IRAS-only, standard	Flow 2A (AR · `iras` · sg-standard)
`2B-##-*`	AR — aggregated (POS / STI)	Flow 2B (AR · `iras` · sg-aggregated)
`3A-##-purchase-*`	AP — purchases, standard	Flow 3A (AP · `iras` · sg-standard)
`3B-##-pcp-*`	AP — aggregated (PCP)	Flow 3B (AP · `iras` · sg-aggregated)

Authentication

x-api-keystring

API key issued by Staple.

AuthorizationBearer

JWT obtained from the login endpoint.

Path parameters

qidstringRequired

Target queue ID the generated document lands in.

Query parameters

countryenumRequired

Country selector for the mapping. Currently SG only.

Allowed values:

destinationenumRequired

Send target — combined with Transaction Type + Addon to resolve the flow (see description).

Allowed values:

Request

This endpoint expects any.

Response

Request accepted (asynchronous — poll status via GET /v2/supernova/models/document/{requestId}).