curl --request POST \
  --url https://api.salessequencer.com/api/v1/testing/send \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "body": "<string>",
  "mailbox_id": 123,
  "subject": "<string>",
  "to_address": "<string>"
}
'

import requests

url = "https://api.salessequencer.com/api/v1/testing/send"

payload = {
    "body": "<string>",
    "mailbox_id": 123,
    "subject": "<string>",
    "to_address": "<string>"
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    body: JSON.stringify('<string>'),
    mailbox_id: 123,
    subject: '<string>',
    to_address: '<string>'
  })
};

fetch('https://api.salessequencer.com/api/v1/testing/send', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));