`invoices.setProject`

Tie up to 100 invoices to a project (a project tag's id from tags.list) or clear it with projectId null. Works on issued invoices too, because the project is internal and never printed. Archived projects can't be chosen. Returns the invoices changed and any left alone.

POST/api/v1/accounting/invoices.setProject

Permissions

accounting:readaccounting:write

Who can call it

admin, finance

Retries

Idempotency key required

MCP

accounting_invoices_set_project

Fields

idsarray of strings (ID)Required
1–100 items
projectIdstring (ID) or nullRequired
idempotencyKeystringRequired
Any unique text you generate once per intended change, so a retried request only happens once. Send it as the Idempotency-Key header instead if you prefer; if you send both they must match.
8–200 characters

curl https://app.getoatmilk.com/api/v1/accounting/invoices.setProject \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "ids": [
    "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d"
  ],
  "projectId": "4d5e6f7a-8b9c-4d0e-8f1a-2b3c4d5e6f7a"
}'

const response = await fetch("https://app.getoatmilk.com/api/v1/accounting/invoices.setProject", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.OATMILK_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "ids": [
      "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d"
    ],
    "projectId": "4d5e6f7a-8b9c-4d0e-8f1a-2b3c4d5e6f7a"
  }),
});
const { data, error } = await response.json();
if (!response.ok) throw new Error(`${error.code}: ${error.message}`);
console.log(data);

import os
import uuid

import requests

response = requests.post(
    "https://app.getoatmilk.com/api/v1/accounting/invoices.setProject",
    headers={
        "Authorization": f"Bearer {os.environ['OATMILK_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "ids": [
            "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
        ],
        "projectId": "4d5e6f7a-8b9c-4d0e-8f1a-2b3c4d5e6f7a",
    },
    timeout=30,
)
payload = response.json()
if not response.ok:
    raise RuntimeError(f"{payload['error']['code']}: {payload['error']['message']}")
print(payload["data"])

Response

{
  "data": { … }
}

Try it

Checks your input with this action’s real schema and answers like the API, with synthetic data. No key needed, and nothing changes.

Input

POST/api/v1/accounting/invoices.setProject

curl https://app.getoatmilk.com/api/v1/accounting/invoices.setProject \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "ids": [
    "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d"
  ],
  "projectId": "4d5e6f7a-8b9c-4d0e-8f1a-2b3c4d5e6f7a"
}'

const response = await fetch("https://app.getoatmilk.com/api/v1/accounting/invoices.setProject", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.OATMILK_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "ids": [
      "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d"
    ],
    "projectId": "4d5e6f7a-8b9c-4d0e-8f1a-2b3c4d5e6f7a"
  }),
});
const { data, error } = await response.json();
if (!response.ok) throw new Error(`${error.code}: ${error.message}`);
console.log(data);

import os
import uuid

import requests

response = requests.post(
    "https://app.getoatmilk.com/api/v1/accounting/invoices.setProject",
    headers={
        "Authorization": f"Bearer {os.environ['OATMILK_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "ids": [
            "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
        ],
        "projectId": "4d5e6f7a-8b9c-4d0e-8f1a-2b3c4d5e6f7a",
    },
    timeout=30,
)
payload = response.json()
if not response.ok:
    raise RuntimeError(f"{payload['error']['code']}: {payload['error']['message']}")
print(payload["data"])

Fields

Example

Try it