Solk ERP API

Send sales invoices

Sends sales and return invoices; the company card's open / paid, overdue and last-12-months revenue come from these. customer is the account's ext_id or code (with only customer_name it is matched by name). remaining = unpaid amount; without status it is derived from it (open, partial, paid, cancelled). kind: return is a return invoice (amounts count as negative). po is the customer's order number — used to match the CRM order. If no balances are sent, the overdue amount is computed from invoices.

POST/api/erp/v1/invoices

Authorization

Authorizationheaderrequired

Solk ERP API key (erp_…): shown once when a Solk ERP API connection is created under Settings → Accounting & ERP. May also be sent as the X-Solk-Erp-Key header.

Body application/json

itemsarrayrequired

Invoices: ext_id, no, customer, customer_name, date, due, currency, net, total, remaining, status, kind (sales · return), po, lines (code, name, qty, price).

Errors

HTTP	error	Meaning
`401`	`unauthorized`	Missing, invalid, expired or revoked token.
`400`	`invalid`	Missing or invalid field (`message` explains).
`413`	`too_many`	At most 2,000 records per request.
`429`	`rate_limited`	Per-minute request limit exceeded (`Retry-After`).

Request

curl -X POST https://ornek.solk.app/api/erp/v1/invoices \
  -H "Authorization: Bearer $SOLK_ERP_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "items": [
    {
      "ext_id": "SF2026000412",
      "no": "SF2026000412",
      "customer": "120.01.045",
      "date": "2026-08-28",
      "due": "2026-09-27",
      "currency": "TRY",
      "net": 49500,
      "total": 59400,
      "remaining": 59400,
      "po": "PO-7702",
      "lines": [
        {
          "code": "HS30",
          "name": "HS 30 Isıl Yapışma Laki",
          "qty": 450,
          "price": 110
        }
      ]
    },
    {
      "ext_id": "SF2026000455",
      "no": "SF2026000455",
      "customer": "120.01.045",
      "date": "2026-09-30",
      "due": "2026-11-29",
      "currency": "TRY",
      "net": 132000,
      "total": 158400,
      "remaining": 158400,
      "po": "PO-7745"
    },
    {
      "ext_id": "SF2026000391",
      "no": "SF2026000391",
      "customer": "120.01.045",
      "date": "2026-07-26",
      "due": "2026-09-24",
      "currency": "TRY",
      "net": 80000,
      "total": 96000,
      "remaining": 0,
      "status": "paid"
    }
  ]
}'

const res = await fetch("https://ornek.solk.app/api/erp/v1/invoices", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.SOLK_ERP_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "items": [
      {
        "ext_id": "SF2026000412",
        "no": "SF2026000412",
        "customer": "120.01.045",
        "date": "2026-08-28",
        "due": "2026-09-27",
        "currency": "TRY",
        "net": 49500,
        "total": 59400,
        "remaining": 59400,
        "po": "PO-7702",
        "lines": [
          {
            "code": "HS30",
            "name": "HS 30 Isıl Yapışma Laki",
            "qty": 450,
            "price": 110
          }
        ]
      },
      {
        "ext_id": "SF2026000455",
        "no": "SF2026000455",
        "customer": "120.01.045",
        "date": "2026-09-30",
        "due": "2026-11-29",
        "currency": "TRY",
        "net": 132000,
        "total": 158400,
        "remaining": 158400,
        "po": "PO-7745"
      },
      {
        "ext_id": "SF2026000391",
        "no": "SF2026000391",
        "customer": "120.01.045",
        "date": "2026-07-26",
        "due": "2026-09-24",
        "currency": "TRY",
        "net": 80000,
        "total": 96000,
        "remaining": 0,
        "status": "paid"
      }
    ]
  }),
});
const data = await res.json();

import os, requests

r = requests.post(
    "https://ornek.solk.app/api/erp/v1/invoices",
    headers={"Authorization": f"Bearer {os.environ['SOLK_ERP_KEY']}"},
    json={
        "items": [
            {
                "ext_id": "SF2026000412",
                "no": "SF2026000412",
                "customer": "120.01.045",
                "date": "2026-08-28",
                "due": "2026-09-27",
                "currency": "TRY",
                "net": 49500,
                "total": 59400,
                "remaining": 59400,
                "po": "PO-7702",
                "lines": [
                    {
                        "code": "HS30",
                        "name": "HS 30 Isıl Yapışma Laki",
                        "qty": 450,
                        "price": 110
                    }
                ]
            },
            {
                "ext_id": "SF2026000455",
                "no": "SF2026000455",
                "customer": "120.01.045",
                "date": "2026-09-30",
                "due": "2026-11-29",
                "currency": "TRY",
                "net": 132000,
                "total": 158400,
                "remaining": 158400,
                "po": "PO-7745"
            },
            {
                "ext_id": "SF2026000391",
                "no": "SF2026000391",
                "customer": "120.01.045",
                "date": "2026-07-26",
                "due": "2026-09-24",
                "currency": "TRY",
                "net": 80000,
                "total": 96000,
                "remaining": 0,
                "status": "paid"
            }
        ]
    },
)
print(r.json())

Response

{
  "new": 3,
  "ok": true,
  "received": 3
}

Example responses were captured from a v54 installation running sample data; lists are shortened to two items.