On behalf of

curl -X 'POST' \ 'https://api.boldsign.com/v1/document/send' \
     -H 'accept: application/json' \
     -H 'X-API-KEY: {your API key}' \
     -H 'Content-Type: multipart/form-data' \
     -F 'DisableExpiryAlert=false' \
     -F 'ReminderSettings.ReminderDays=3' \
     -F 'BrandId=' \
     -F 'ReminderSettings.ReminderCount=5' \
     -F 'EnableReassign=true' \
     -F 'Message=Please sign this.' \
     -F 'Signers={
          "name": "David",
          "emailAddress": "david@cubeflakes.com",
          "formFields": [
            {
              "fieldType": "Signature",
              "pageNumber": 1,
              "bounds": {
                "x": 100,
                "y": 100,
                "width": 100,
                "height": 50
              },
              "isRequired": true
            }
          ]
        }' \
      -F 'ExpiryDays=10' \
      -F 'EnablePrintAndSign=false' \
      -F 'AutoDetectFields=false' \
      -F 'OnBehalfOf=luthercooper@cubeflakes.com' \
      -F 'EnableSigningOrder=false' \
      -F 'UseTextTags=false' \
      -F 'SendLinkValidTill=' \
      -F 'Files=@agreement.pdf;type=application/pdf' \
      -F 'Title=Agreement' \
      -F 'HideDocumentId=false' \
      -F 'EnableEmbeddedSigning=false' \
      -F 'ExpiryDateType=Days' \
      -F 'ReminderSettings.EnableAutoReminder=false' \
      -F 'ExpiryValue=60' \
      -F 'DisableEmails=false' \
      -F 'DisableSMS=false'

var apiClient = new ApiClient("https://api.boldsign.com", "{your API key}");
var documentClient = new DocumentClient(apiClient);

var documentFilePath = new DocumentFilePath
{
    ContentType = "application/pdf",
    FilePath = "agreement.pdf", 
};

var filesToUpload = new List<IDocumentFile>
{
    documentFilePath,
};

var signatureField = new FormField(
  id: "sign",
  isRequired: true,
  type:FieldType.Signature,
  pageNumber: 1,
  bounds: new Rectangle(x: 100, y: 100, width: 100, height: 50));

var formFieldCollections = new List<FormField>()
{
    signatureField
};

var signer = new DocumentSigner(
  name: "David",
  emailAddress: "david@cubeflakes.com",
  formFields: formFieldCollections);

var documentSigners = new List<DocumentSigner>()
{
     signer
};

var sendForSign = new SendForSign()
{
    Message = "please sign this",
    Title = "Agreement",
    HideDocumentId = false,
    Signers = documentSigners,
    Files = filesToUpload,
    OnBehalfOf = "luthercooper@cubeflakes.com"
    };
var documentCreated = documentClient.SendDocument(sendForSign);

import requests

url = "https://api.boldsign.com/v1/document/send"

payload={'DisableExpiryAlert': 'false',
'ReminderSettings.ReminderDays': '3',
'BrandId': '',
'ReminderSettings.ReminderCount': '5',
'EnableReassign': 'true',
'Message': 'Please sign this.',
'Signers': '{
          "name": "David",
          "emailAddress": "david@cubeflakes.com",
          "formFields": [
            {
              "fieldType": "Signature",
              "pageNumber": 1,
              "bounds": {
                "x": 100,
                "y": 100,
                "width": 100,
                "height": 50
              },
              "isRequired": true
            }
          ]
        }',
'ExpiryDays': '10',
'EnablePrintAndSign': 'false',
'AutoDetectFields': 'false',
'OnBehalfOf': 'luthercooper@cubeflakes.com',
'EnableSigningOrder': 'false',
'UseTextTags': 'false',
'SendLinkValidTill': '',
'Title': 'Agreement',
'HideDocumentId': 'false',
'EnableEmbeddedSigning': 'false',
'ExpiryDateType': 'Days',
'ReminderSettings.EnableAutoReminder': 'false',
'ExpiryValue': '60',
'DisableEmails': 'false',
'DisableSMS': 'false'}
files=[
  ('Files',('file',open('{file path}','rb'),'application/octet-stream'))
]
headers = {
  'accept': 'application/json',
  'X-API-KEY': '{your API key}'
}

response = requests.request("POST", url, headers=headers, data=payload, files=files)

print(response.text)

const axios = require('axios');
const FormData = require('form-data');
const fs = require('fs');

const form = new FormData();
form.append('DisableExpiryAlert', 'false');
form.append('ReminderSettings.ReminderDays', '3');
form.append('BrandId', '');
form.append('ReminderSettings.ReminderCount', '5');
form.append('EnableReassign', 'true');
form.append('Message', 'Please sign this.');
form.append('Signers', '{\n  "name": "David",\n  "emailAddress": "david@cubeflakes.com",\n  "formFields": [\n    {\n      "fieldType": "Signature",\n      "pageNumber": 1,\n      "bounds": {\n        "x": 100,\n        "y": 100,\n        "width": 100,\n        "height": 50\n      },\n      "isRequired": true\n    }\n  ]\n}');
form.append('ExpiryDays', '10');
form.append('EnablePrintAndSign', 'false');
form.append('AutoDetectFields', 'false');
form.append('OnBehalfOf', 'luthercooper@cubeflakes.com');
form.append('EnableSigningOrder', 'false');
form.append('UseTextTags', 'false');
form.append('SendLinkValidTill', '');
form.append('Files', fs.readFileSync('agreement.pdf;type=application/pdf'), 'agreement.pdf;type=application/pdf');
form.append('Title', 'Agreement');
form.append('HideDocumentId', 'false');
form.append('EnableEmbeddedSigning', 'false');
form.append('ExpiryDateType', 'Days');
form.append('ReminderSettings.EnableAutoReminder', 'false');
form.append('ExpiryValue', '60');
form.append('DisableEmails', 'false');
form.append('DisableSMS', 'false');

const response = await axios.post(
'https://api.boldsign.com/v1/document/send',
form,
{
  headers: {
    ...form.getHeaders(),
    'accept': 'application/json',
    'X-API-KEY': '{your API key}',
    'Content-Type': 'multipart/form-data'
  }
}
);