curl -X POST "https://server.smartlead.ai/api/v1/campaigns/{campaign_id}/sequences?api_key=YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "sequences": [
      {
        "id": null,
        "seq_number": 1,
        "subject": "Hello {{first_name}}",
        "email_body": "<p>Hi {{first_name}},</p><p>I wanted to reach out...</p>",
        "seq_delay_details": {
          "delay_in_days": 0
        }
      },
      {
        "id": null,
        "seq_number": 2,
        "subject": "",
        "email_body": "<p>Just following up on my previous email...</p>",
        "seq_delay_details": {
          "delay_in_days": 3
        }
      }
    ]
  }'

import requests

API_KEY = "YOUR_API_KEY"

response = requests.post(
    "https://server.smartlead.ai/api/v1/campaigns/{campaign_id}/sequences",
    params={"api_key": API_KEY},
    json={
        "sequences": [
            {
                "id": None,
                "seq_number": 1,
                "subject": "Hello {{first_name}}",
                "email_body": "<p>Hi {{first_name}},</p><p>I wanted to reach out...</p>",
                "seq_delay_details": {"delay_in_days": 0}
            },
            {
                "id": None,
                "seq_number": 2,
                "subject": "",
                "email_body": "<p>Just following up on my previous email...</p>",
                "seq_delay_details": {"delay_in_days": 3}
            }
        ]
    }
)

result = response.json()
print(result)

const API_KEY = 'YOUR_API_KEY';

const response = await fetch(
  `https://server.smartlead.ai/api/v1/campaigns/${campaignId}/sequences?api_key=${API_KEY}`,
  {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      sequences: [
        {
          id: null,
          seq_number: 1,
          subject: 'Hello {{first_name}}',
          email_body: '<p>Hi {{first_name}},</p><p>I wanted to reach out...</p>',
          seq_delay_details: { delay_in_days: 0 }
        },
        {
          id: null,
          seq_number: 2,
          subject: '',
          email_body: '<p>Just following up on my previous email...</p>',
          seq_delay_details: { delay_in_days: 3 }
        }
      ]
    })
  }
);

const result = await response.json();
console.log(result);

{
  "ok": true,
  "data": [
    {
      "id": 1001,
      "seq_number": 1,
      "subject": "Hello {{first_name}}",
      "email_body": "<p>Hi {{first_name}},</p><p>I wanted to reach out...</p>"
    },
    {
      "id": 1002,
      "seq_number": 2,
      "subject": "Re: Hello {{first_name}}",
      "email_body": "<p>Just following up on my previous email...</p>"
    }
  ]
}

{
  "message": "Invalid API Key"
}

{
  "error": "Resource not found"
}

{
  "error": "Invalid parameters provided"
}