`mail.drafts.update`

Save reviewed company financial facts with current message and draft revisions.

POST/api/v1/accounting/mail.drafts.update

Permissions

mail:readmail:write

Who can call it

admin, finance

Retries

Idempotency key required, with expectedRevision

MCP

accounting_mail_drafts_update

Fields

idstring (ID)Required
The record's ID.
expectedRevisionintegerRequired
The record's current revision, from the last time you read it. If someone changed the record since, the request is refused with a conflict so you can reload and check before trying again.
at most 9007199254740991 · greater than 0
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.
8–160 characters
messageRevisionintegerRequired
The related record's current revision, from the last time you read it.
at most 9007199254740991 · greater than 0
factsobjectRequired
No other fields

curl https://app.getoatmilk.com/api/v1/accounting/mail.drafts.update \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
  "expectedRevision": 3,
  "messageRevision": 3,
  "facts": {
    "receipts": [
      {
        "merchant": "example",
        "date": "2026-09-30",
        "currency": "CAD",
        "total": "1.5",
        "subtotal": "1.5",
        "tax": "1.5",
        "tip": "1.5",
        "discount": "1.5",
        "type": "expense",
        "invoiceNumber": "example",
        "description": "Synthetic example from the docs",
        "taxes": [
          {
            "label": "example",
            "amount": "1.5"
          }
        ],
        "sourceEvidenceIds": [
          "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10"
        ],
        "warnings": [
          "example"
        ],
        "documentKind": "receipt",
        "paymentState": "paid"
      }
    ],
    "warnings": [
      "example"
    ]
  }
}'

const response = await fetch("https://app.getoatmilk.com/api/v1/accounting/mail.drafts.update", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.OATMILK_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
    "expectedRevision": 3,
    "messageRevision": 3,
    "facts": {
      "receipts": [
        {
          "merchant": "example",
          "date": "2026-09-30",
          "currency": "CAD",
          "total": "1.5",
          "subtotal": "1.5",
          "tax": "1.5",
          "tip": "1.5",
          "discount": "1.5",
          "type": "expense",
          "invoiceNumber": "example",
          "description": "Synthetic example from the docs",
          "taxes": [
            {
              "label": "example",
              "amount": "1.5"
            }
          ],
          "sourceEvidenceIds": [
            "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10"
          ],
          "warnings": [
            "example"
          ],
          "documentKind": "receipt",
          "paymentState": "paid"
        }
      ],
      "warnings": [
        "example"
      ]
    }
  }),
});
const { data, error } = await response.json();
if (!response.ok) throw new Error(`${error.code}: ${error.message}`);
console.log(data);

import os
import uuid

import requests

response = requests.post(
    "https://app.getoatmilk.com/api/v1/accounting/mail.drafts.update",
    headers={
        "Authorization": f"Bearer {os.environ['OATMILK_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
        "expectedRevision": 3,
        "messageRevision": 3,
        "facts": {
            "receipts": [
                {
                    "merchant": "example",
                    "date": "2026-09-30",
                    "currency": "CAD",
                    "total": "1.5",
                    "subtotal": "1.5",
                    "tax": "1.5",
                    "tip": "1.5",
                    "discount": "1.5",
                    "type": "expense",
                    "invoiceNumber": "example",
                    "description": "Synthetic example from the docs",
                    "taxes": [
                        {
                            "label": "example",
                            "amount": "1.5",
                        },
                    ],
                    "sourceEvidenceIds": [
                        "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10",
                    ],
                    "warnings": [
                        "example",
                    ],
                    "documentKind": "receipt",
                    "paymentState": "paid",
                },
            ],
            "warnings": [
                "example",
            ],
        },
    },
    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/mail.drafts.update

curl https://app.getoatmilk.com/api/v1/accounting/mail.drafts.update \
  -H "Authorization: Bearer $OATMILK_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
  "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
  "expectedRevision": 3,
  "messageRevision": 3,
  "facts": {
    "receipts": [
      {
        "merchant": "example",
        "date": "2026-09-30",
        "currency": "CAD",
        "total": "1.5",
        "subtotal": "1.5",
        "tax": "1.5",
        "tip": "1.5",
        "discount": "1.5",
        "type": "expense",
        "invoiceNumber": "example",
        "description": "Synthetic example from the docs",
        "taxes": [
          {
            "label": "example",
            "amount": "1.5"
          }
        ],
        "sourceEvidenceIds": [
          "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10"
        ],
        "warnings": [
          "example"
        ],
        "documentKind": "receipt",
        "paymentState": "paid"
      }
    ],
    "warnings": [
      "example"
    ]
  }
}'

const response = await fetch("https://app.getoatmilk.com/api/v1/accounting/mail.drafts.update", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.OATMILK_API_KEY}`,
    "Content-Type": "application/json",
    "Idempotency-Key": crypto.randomUUID(),
  },
  body: JSON.stringify({
    "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
    "expectedRevision": 3,
    "messageRevision": 3,
    "facts": {
      "receipts": [
        {
          "merchant": "example",
          "date": "2026-09-30",
          "currency": "CAD",
          "total": "1.5",
          "subtotal": "1.5",
          "tax": "1.5",
          "tip": "1.5",
          "discount": "1.5",
          "type": "expense",
          "invoiceNumber": "example",
          "description": "Synthetic example from the docs",
          "taxes": [
            {
              "label": "example",
              "amount": "1.5"
            }
          ],
          "sourceEvidenceIds": [
            "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10"
          ],
          "warnings": [
            "example"
          ],
          "documentKind": "receipt",
          "paymentState": "paid"
        }
      ],
      "warnings": [
        "example"
      ]
    }
  }),
});
const { data, error } = await response.json();
if (!response.ok) throw new Error(`${error.code}: ${error.message}`);
console.log(data);

import os
import uuid

import requests

response = requests.post(
    "https://app.getoatmilk.com/api/v1/accounting/mail.drafts.update",
    headers={
        "Authorization": f"Bearer {os.environ['OATMILK_API_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
    json={
        "id": "9a8b7c6d-5e4f-4a3b-8c2d-1e0f9a8b7c6d",
        "expectedRevision": 3,
        "messageRevision": 3,
        "facts": {
            "receipts": [
                {
                    "merchant": "example",
                    "date": "2026-09-30",
                    "currency": "CAD",
                    "total": "1.5",
                    "subtotal": "1.5",
                    "tax": "1.5",
                    "tip": "1.5",
                    "discount": "1.5",
                    "type": "expense",
                    "invoiceNumber": "example",
                    "description": "Synthetic example from the docs",
                    "taxes": [
                        {
                            "label": "example",
                            "amount": "1.5",
                        },
                    ],
                    "sourceEvidenceIds": [
                        "7f0f6c1e-1c1f-4b5e-9c8d-2f5e8e3c1a10",
                    ],
                    "warnings": [
                        "example",
                    ],
                    "documentKind": "receipt",
                    "paymentState": "paid",
                },
            ],
            "warnings": [
                "example",
            ],
        },
    },
    timeout=30,
)
payload = response.json()
if not response.ok:
    raise RuntimeError(f"{payload['error']['code']}: {payload['error']['message']}")
print(payload["data"])

Fields

Fields inside facts

Example

Try it