Email templates

Templates behind the emails NolaPro sends. action is the key that identifies which email a template is for; name is the human label. No lastchangedate, so no modifiedsince.

The object#

Field	Type	Description
idread-only	integer	NolaPro id.
action	string(20)	The code this resource is keyed by. Matching is case insensitive.
name	string(200)	Human label for the template.
subject	string(255)	Subject line.
body	text	Template body.
cancel	boolean	True once cancelled. Cancelled rows stay referenced by history.
externalid	string(100)	Your own key for this email templates. Scoped to your company.

Endpoints#

POST/emailtemplates/batch 207

Create many.

Always answers 207, one result per item.

Requires scope setup:write.

Parameters

Name	In	Type	Notes
Idempotency-Key	header	string	Makes the write safely retryable. Any unique string per logical operation; a UUID is fine. The failure this prevents is specific: the request succeeds, the response is lost to a timeout, you retry, and the customer is billed twice. With a key, the retry returns the original response - same status, same body, same id - and creates nothing. The body is part of the key's identity. Reusing a key with a different body is a bug on your side, not a retry, and answers `409 idempotency_replay` rather than silently handing back the old response. Keys are remembered for 24 hours.

Body array

Field	Type	Description
idread-only	integer	NolaPro id.
action	string(20)	The code this resource is keyed by. Matching is case insensitive.
name	string(200)	Human label for the template.
subject	string(255)	Subject line.
body	text	Template body.
cancel	boolean	True once cancelled. Cancelled rows stay referenced by history.
externalid	string(100)	Your own key for this email templates. Scoped to your company.

curl -X POST \
  'https://acme.nolapro.com/!/api/v2/emailtemplates/batch' \
  -H 'Authorization: Bearer $NP_TOKEN' \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: your-unique-key' \
  -d '[
    {
        "id": 2,
        "action": "invoice",
        "name": "Invoice email",
        "subject": "",
        "body": "",
        "cancel": false
    }
]'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates/batch');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST  => 'POST',
  CURLOPT_POSTFIELDS     => json_encode([
    [
      'id' => 2,
      'action' => 'invoice',
      'name' => 'Invoice email',
      'subject' => '',
      'body' => '',
      'cancel' => false,
    ],
  ]),
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.post(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/batch",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
    json=[
        {
            "id": 2,
            "action": "invoice",
            "name": "Invoice email",
            "subject": "",
            "body": "",
            "cancel": False,
        },
    ],
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates/batch',
  {
    method: 'POST',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
    body: JSON.stringify([
      {
        id: 2,
        action: "invoice",
        name: "Invoice email",
        subject: "",
        body: "",
        cancel: false,
      },
    ]),
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var body = new[] {
    new {
        id = 2,
        action = "invoice",
        name = "Invoice email",
        subject = "",
        body = "",
        cancel = false,
    },
};

var req = new HttpRequestMessage(HttpMethod.Post,
    "https://acme.nolapro.com/!/api/v2/emailtemplates/batch") {
    Content = JsonContent.Create(body),
};
req.Headers.Add("Idempotency-Key", "your-unique-key");

var res = await http.SendAsync(req);
res.EnsureSuccessStatusCode();

GET/emailtemplates 200403

List email templates.

Requires scope setup:read.

Parameters

Name	In	Type	Notes
name	query	string	name. Partial match, case-insensitive.
action	query	string	Partial match, case insensitive.
cancel	query	string	Defaults to `false`. Pass `true` for cancelled only, or `any`.
externalid	query	string	Exact match on your own key. Scoped to your company.
include	query	string	Comma-separated extras to embed. Only `custom_fields` is available: the extra fields this install has defined on the record. Off by default, and an unrecognised value is refused rather than ignored. See Conventions.

When it fails

Status	Code	Meaning
403	insufficient_scope	Token lacks `emailtemplates:read`.

curl \
  'https://acme.nolapro.com/!/api/v2/emailtemplates' \
  -H 'Authorization: Bearer $NP_TOKEN'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.get(
    "https://acme.nolapro.com/!/api/v2/emailtemplates",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates',
  {
    method: 'GET',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var res = await http.GetAsync(
    "https://acme.nolapro.com/!/api/v2/emailtemplates");
res.EnsureSuccessStatusCode();

POST/emailtemplates 201400409

Create.

Requires scope setup:write.

Parameters

Name	In	Type	Notes
Idempotency-Key	header	string	Makes the write safely retryable. Any unique string per logical operation; a UUID is fine. The failure this prevents is specific: the request succeeds, the response is lost to a timeout, you retry, and the customer is billed twice. With a key, the retry returns the original response - same status, same body, same id - and creates nothing. The body is part of the key's identity. Reusing a key with a different body is a bug on your side, not a retry, and answers `409 idempotency_replay` rather than silently handing back the old response. Keys are remembered for 24 hours.

Body

Field	Type	Description
idread-only	integer	NolaPro id.
action	string(20)	The code this resource is keyed by. Matching is case insensitive.
name	string(200)	Human label for the template.
subject	string(255)	Subject line.
body	text	Template body.
cancel	boolean	True once cancelled. Cancelled rows stay referenced by history.
externalid	string(100)	Your own key for this email templates. Scoped to your company.

When it fails

Status	Code	Meaning
400	invalid_request	A required field was missing or invalid.
409	duplicate	That code is already in use.

curl -X POST \
  'https://acme.nolapro.com/!/api/v2/emailtemplates' \
  -H 'Authorization: Bearer $NP_TOKEN' \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: your-unique-key' \
  -d '{
    "id": 2,
    "action": "invoice",
    "name": "Invoice email",
    "subject": "",
    "body": "",
    "cancel": false
}'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST  => 'POST',
  CURLOPT_POSTFIELDS     => json_encode([
    'id' => 2,
    'action' => 'invoice',
    'name' => 'Invoice email',
    'subject' => '',
    'body' => '',
    'cancel' => false,
  ]),
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.post(
    "https://acme.nolapro.com/!/api/v2/emailtemplates",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
    json={
        "id": 2,
        "action": "invoice",
        "name": "Invoice email",
        "subject": "",
        "body": "",
        "cancel": False,
    },
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates',
  {
    method: 'POST',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
    body: JSON.stringify({
      id: 2,
      action: "invoice",
      name: "Invoice email",
      subject: "",
      body: "",
      cancel: false,
    }),
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var body = new {
    id = 2,
    action = "invoice",
    name = "Invoice email",
    subject = "",
    body = "",
    cancel = false,
};

var req = new HttpRequestMessage(HttpMethod.Post,
    "https://acme.nolapro.com/!/api/v2/emailtemplates") {
    Content = JsonContent.Create(body),
};
req.Headers.Add("Idempotency-Key", "your-unique-key");

var res = await http.SendAsync(req);
res.EnsureSuccessStatusCode();

Response 201

{
    "id": 2,
    "action": "invoice",
    "name": "Invoice email",
    "subject": "",
    "body": "",
    "cancel": false
}

GET/emailtemplates/{id} 200404

Retrieve one record.

Requires scope setup:read.

Parameters

Name	In	Type	Notes
idrequired	path	integer	The record id.
include	query	string	Comma-separated extras to embed. Only `custom_fields` is available: the extra fields this install has defined on the record. Off by default, and an unrecognised value is refused rather than ignored. See Conventions.

When it fails

Status	Code	Meaning
404	not_found	No record with that id.

curl \
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104' \
  -H 'Authorization: Bearer $NP_TOKEN'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates/104');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.get(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104',
  {
    method: 'GET',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var res = await http.GetAsync(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104");
res.EnsureSuccessStatusCode();

Response 200

{
    "id": 2,
    "action": "invoice",
    "name": "Invoice email",
    "subject": "",
    "body": "",
    "cancel": false
}

PATCH/emailtemplates/{id} 200404409

Update.

Requires scope setup:write.

Parameters

Name	In	Type	Notes
idrequired	path	integer	The record id.
Idempotency-Key	header	string	Makes the write safely retryable. Any unique string per logical operation; a UUID is fine. The failure this prevents is specific: the request succeeds, the response is lost to a timeout, you retry, and the customer is billed twice. With a key, the retry returns the original response - same status, same body, same id - and creates nothing. The body is part of the key's identity. Reusing a key with a different body is a bug on your side, not a retry, and answers `409 idempotency_replay` rather than silently handing back the old response. Keys are remembered for 24 hours.

Body

Field	Type	Description
idread-only	integer	NolaPro id.
action	string(20)	The code this resource is keyed by. Matching is case insensitive.
name	string(200)	Human label for the template.
subject	string(255)	Subject line.
body	text	Template body.
cancel	boolean	True once cancelled. Cancelled rows stay referenced by history.
externalid	string(100)	Your own key for this email templates. Scoped to your company.

When it fails

Status	Code	Meaning
404	not_found	No record with that id.
409	stale_record	`If-Match` did not match.

curl -X PATCH \
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104' \
  -H 'Authorization: Bearer $NP_TOKEN' \
  -H 'Content-Type: application/json' \
  -H 'Idempotency-Key: your-unique-key' \
  -d '{
    "id": 2,
    "action": "invoice",
    "name": "Invoice email",
    "subject": "",
    "body": "",
    "cancel": false
}'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates/104');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST  => 'PATCH',
  CURLOPT_POSTFIELDS     => json_encode([
    'id' => 2,
    'action' => 'invoice',
    'name' => 'Invoice email',
    'subject' => '',
    'body' => '',
    'cancel' => false,
  ]),
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.patch(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
    json={
        "id": 2,
        "action": "invoice",
        "name": "Invoice email",
        "subject": "",
        "body": "",
        "cancel": False,
    },
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104',
  {
    method: 'PATCH',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
    body: JSON.stringify({
      id: 2,
      action: "invoice",
      name: "Invoice email",
      subject: "",
      body: "",
      cancel: false,
    }),
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var body = new {
    id = 2,
    action = "invoice",
    name = "Invoice email",
    subject = "",
    body = "",
    cancel = false,
};

var req = new HttpRequestMessage(HttpMethod.Patch,
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104") {
    Content = JsonContent.Create(body),
};
req.Headers.Add("Idempotency-Key", "your-unique-key");

var res = await http.SendAsync(req);
res.EnsureSuccessStatusCode();

Response 200

{
    "id": 2,
    "action": "invoice",
    "name": "Invoice email",
    "subject": "",
    "body": "",
    "cancel": false
}

DELETE/emailtemplates/{id} 200403404

Cancel.

Sets the cancel flag. Nothing is removed.

Requires scope setup:cancel.

Parameters

Name	In	Type	Notes
idrequired	path	integer	The record id.
Idempotency-Key	header	string	Makes the write safely retryable. Any unique string per logical operation; a UUID is fine. The failure this prevents is specific: the request succeeds, the response is lost to a timeout, you retry, and the customer is billed twice. With a key, the retry returns the original response - same status, same body, same id - and creates nothing. The body is part of the key's identity. Reusing a key with a different body is a bug on your side, not a retry, and answers `409 idempotency_replay` rather than silently handing back the old response. Keys are remembered for 24 hours.

When it fails

Status	Code	Meaning
403	insufficient_scope	Needs `emailtemplates:cancel`.
404	not_found	No record with that id.

curl -X DELETE \
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104' \
  -H 'Authorization: Bearer $NP_TOKEN'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates/104');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_CUSTOMREQUEST  => 'DELETE',
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.delete(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104',
  {
    method: 'DELETE',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var req = new HttpRequestMessage(HttpMethod.Delete,
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104");

var res = await http.SendAsync(req);
res.EnsureSuccessStatusCode();

Response 200

{
    "id": 2,
    "action": "invoice",
    "name": "Invoice email",
    "subject": "",
    "body": "",
    "cancel": false
}

GET/emailtemplates/{id}/attachments 200404

List files attached to an email template.

The attachments on this email template, newest first. Accepted filedefinitionid values: 46 (default 46). Metadata only - each file's bytes are at GET /attachments/{id}/content.

Requires scope setup:read.

Parameters

Name	In	Type	Notes
idrequired	path	integer	The email template id.
filedefinitionid	query	integer	Only files in this list. Accepted `filedefinitionid` values: 46 (default 46).
filecategoryid	query	integer	Only files filed under this category.
filename	query	string	Partial match on the file name, case insensitive.

When it fails

Status	Code	Meaning
404	not_found	No email template with that id in this company.

curl \
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments' \
  -H 'Authorization: Bearer $NP_TOKEN'

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN')],
  CURLOPT_RETURNTRANSFER => true,
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

r = requests.get(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments",
    headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}"},
)
r.raise_for_status()

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments',
  {
    method: 'GET',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}` },
  }
);
const data = await res.json();

using System.Net.Http.Json;

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

var res = await http.GetAsync(
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments");
res.EnsureSuccessStatusCode();

POST/emailtemplates/{id}/attachments 201400404409413415422

Attach a file to an email template.

multipart/form-data with one file part; see the AttachmentUpload schema for the other parts. Accepted filedefinitionid values: 46 (default 46). Answers 201 with the attachment's metadata and Location: /attachments/{id}. Check _meta.warnings for datatype_truncated and stored_under_parent_company.

Requires scope setup:write.

Parameters

Name	In	Type	Notes
idrequired	path	integer	The email template id.
Idempotency-Key	header	string	Makes the write safely retryable. Any unique string per logical operation; a UUID is fine. The failure this prevents is specific: the request succeeds, the response is lost to a timeout, you retry, and the customer is billed twice. With a key, the retry returns the original response - same status, same body, same id - and creates nothing. The body is part of the key's identity. Reusing a key with a different body is a bug on your side, not a retry, and answers `409 idempotency_replay` rather than silently handing back the old response. Keys are remembered for 24 hours.

Body multipart/form-data

Field	Type	Description
filerequired	string	The file. Exactly one part named `file`; a second one, or `file[]`, is `400 invalid_request` so an idempotent retry can never half-succeed. Empty is refused. Over the cap (the smaller of `APIV2_MAX_UPLOAD_BYTES`, 64 MB by default, and PHP's `upload_max_filesize` / `post_max_size`) is `413 payload_too_large` naming the limit that applied.
filename	string(255)	Overrides the part's file name.
notes	text	Free text shown beside the file.
filedefinitionid	integer	Only when the parent accepts more than one list. Anything the parent does not accept is `422 unknown_value` naming the accepted ids.
filecategoryid	integer	Category by id.
filecategory	string(255)	Category by name. Sent with `filecategoryid` and disagreeing is `422 conflicting_reference`.

When it fails

Status	Code	Meaning
400	unknown_parameter	A form field that is not on the AttachmentUpload schema.
400	invalid_type	`filedefinitionid` or `filecategoryid` that is not an integer.
404	not_found	No email template with that id in this company.
409	upload_limit_reached	This file list allows a fixed number of files on an email template and it is full. Remove one first.
413	payload_too_large	The file is over the cap. The body names the limit that applied.
415	multipart_required	The body was not `multipart/form-data`.
422	unknown_value	`filedefinitionid` is not one this email template accepts, or the category does not exist in this company.

curl -X POST \
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments' \
  -H 'Authorization: Bearer $NP_TOKEN' \
  -H 'Idempotency-Key: your-unique-key' \
  -F 'file=@grant-letter-signed.pdf' \
  -F 'filename=grant-letter-signed.pdf' \
  -F 'notes=Signed copy received 21 Sep' \
  -F 'filedefinitionid=8' \
  -F 'filecategory=Receipts'

$fields = [
    'filename' => 'grant-letter-signed.pdf',
    'notes' => 'Signed copy received 21 Sep',
    'filedefinitionid' => '8',
    'filecategory' => 'Receipts',
  ];
$fields['file'] = new CURLFile('grant-letter-signed.pdf');

$ch = curl_init('https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments');
curl_setopt_array($ch, [
  CURLOPT_HTTPHEADER     => ['Authorization: Bearer ' . getenv('NP_TOKEN'), 'Idempotency-Key: your-unique-key'],
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_POST           => true,
  CURLOPT_POSTFIELDS     => $fields,
]);
$res = json_decode(curl_exec($ch), true);

import os, requests

with open("grant-letter-signed.pdf", "rb") as fh:
    r = requests.post(
        "https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments",
        headers={"Authorization": f"Bearer {os.environ['NP_TOKEN']}", "Idempotency-Key": "your-unique-key"},
        files={"file": fh},
        data={
            "filename": "grant-letter-signed.pdf",
            "notes": "Signed copy received 21 Sep",
            "filedefinitionid": "8",
            "filecategory": "Receipts",
        },
    )
r.raise_for_status()

import { openAsBlob } from 'node:fs';

const form = new FormData();
form.append('file', await openAsBlob('grant-letter-signed.pdf'), 'grant-letter-signed.pdf');
form.append('filename', "grant-letter-signed.pdf");
form.append('notes', "Signed copy received 21 Sep");
form.append('filedefinitionid', "8");
form.append('filecategory', "Receipts");

const res = await fetch(
  'https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments',
  {
    method: 'POST',
    headers: { Authorization: `Bearer ${process.env.NP_TOKEN}`, 'Idempotency-Key': 'your-unique-key' },
    body: form,
  }
);
const data = await res.json();

var token = Environment.GetEnvironmentVariable("NP_TOKEN");

using var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "Bearer " + token);

using var form = new MultipartFormDataContent();
form.Add(new StreamContent(File.OpenRead("grant-letter-signed.pdf")), "file", "grant-letter-signed.pdf");
form.Add(new StringContent("grant-letter-signed.pdf"), "filename");
form.Add(new StringContent("Signed copy received 21 Sep"), "notes");
form.Add(new StringContent("8"), "filedefinitionid");
form.Add(new StringContent("Receipts"), "filecategory");

var req = new HttpRequestMessage(HttpMethod.Post,
    "https://acme.nolapro.com/!/api/v2/emailtemplates/104/attachments") { Content = form };
req.Headers.Add("Idempotency-Key", "your-unique-key");

var res = await http.SendAsync(req);
res.EnsureSuccessStatusCode();

File categories →

Labels attachments are filed under ("Receipts", "Signed contracts"). Per company. The target of filecategoryid on an attachment. name is unique per company, case-insensitive and trimmed: the File Categories screen does not enforce that, so a duplicate created there is something the API will refuse to add a third of, and creating a name that matches a cancelled category revives it (200, the original id, record_reactivated in _meta.warnings) rather than adding a second row.

Webhook subscriptions →

Subscriptions that push events to your server instead of you polling for them. A subscription belongs to the token that created it and only ever delivers events that token has the scope to read. The envelope, signature verification and the retry schedule are in - read that first; this page is the subscription object and the event catalogue.