curl --request POST \
  --url https://api.klavis.ai/sandbox/resend/{sandbox_id}/initialize \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "contacts": [
    {
      "email": "robert.johnson@techcorp.com",
      "first_name": "Robert",
      "last_name": "Johnson",
      "unsubscribed": false
    },
    {
      "email": "maria.garcia@innovate.io",
      "first_name": "Maria",
      "last_name": "Garcia",
      "unsubscribed": false
    },
    {
      "email": "david.lee@startup.com",
      "first_name": "David",
      "last_name": "Lee",
      "unsubscribed": false
    }
  ],
  "segments": [
    {
      "name": "Premium Customers",
      "broadcasts": [
        {
          "from": "onboarding@resend.dev",
          "subject": "Exclusive Premium Member Benefits This Month",
          "name": "Premium Benefits December",
          "html": "<h1>Premium Member Exclusive</h1><p>As a valued premium member, enjoy these exclusive benefits this month...</p><ul><li>20% off all products</li><li>Early access to new features</li><li>Priority support</li></ul>",
          "text": "Premium Member Exclusive - Enjoy 20% off all products, early access to new features, and priority support this month.",
          "status": "draft"
        }
      ]
    },
    {
      "name": "Newsletter Subscribers",
      "broadcasts": [
        {
          "from": "onboarding@resend.dev",
          "subject": "ACME Monthly Newsletter - December 2025",
          "name": "December Newsletter",
          "html": "<div><h1>December Newsletter</h1><h2>What's New This Month</h2><p>Here are the highlights from December...</p><ul><li>Product updates</li><li>Customer success stories</li><li>Upcoming events</li></ul></div>",
          "text": "December Newsletter - What's New This Month: Product updates, customer success stories, and upcoming events.",
          "reply_to": "feedback@acmecorp.com",
          "status": "draft"
        }
      ]
    },
    {
      "name": "Trial Users",
      "broadcasts": [
        {
          "from": "onboarding@resend.dev",
          "subject": "Getting Started with Your Free Trial",
          "name": "Trial Onboarding Sequence",
          "html": "<h1>Welcome to Your Free Trial!</h1><p>Let's get you started with some helpful resources...</p><div><h3>Quick Start Guide</h3><ol><li>Complete your profile</li><li>Explore the dashboard</li><li>Try our key features</li></ol></div>",
          "text": "Welcome to Your Free Trial! Quick Start Guide: 1) Complete your profile 2) Explore the dashboard 3) Try our key features",
          "status": "draft"
        }
      ]
    }
  ]
}
EOF

import requests

url = "https://api.klavis.ai/sandbox/resend/{sandbox_id}/initialize"

payload = {
    "contacts": [
        {
            "email": "robert.johnson@techcorp.com",
            "first_name": "Robert",
            "last_name": "Johnson",
            "unsubscribed": False
        },
        {
            "email": "maria.garcia@innovate.io",
            "first_name": "Maria",
            "last_name": "Garcia",
            "unsubscribed": False
        },
        {
            "email": "david.lee@startup.com",
            "first_name": "David",
            "last_name": "Lee",
            "unsubscribed": False
        }
    ],
    "segments": [
        {
            "name": "Premium Customers",
            "broadcasts": [
                {
                    "from": "onboarding@resend.dev",
                    "subject": "Exclusive Premium Member Benefits This Month",
                    "name": "Premium Benefits December",
                    "html": "<h1>Premium Member Exclusive</h1><p>As a valued premium member, enjoy these exclusive benefits this month...</p><ul><li>20% off all products</li><li>Early access to new features</li><li>Priority support</li></ul>",
                    "text": "Premium Member Exclusive - Enjoy 20% off all products, early access to new features, and priority support this month.",
                    "status": "draft"
                }
            ]
        },
        {
            "name": "Newsletter Subscribers",
            "broadcasts": [
                {
                    "from": "onboarding@resend.dev",
                    "subject": "ACME Monthly Newsletter - December 2025",
                    "name": "December Newsletter",
                    "html": "<div><h1>December Newsletter</h1><h2>What's New This Month</h2><p>Here are the highlights from December...</p><ul><li>Product updates</li><li>Customer success stories</li><li>Upcoming events</li></ul></div>",
                    "text": "December Newsletter - What's New This Month: Product updates, customer success stories, and upcoming events.",
                    "reply_to": "feedback@acmecorp.com",
                    "status": "draft"
                }
            ]
        },
        {
            "name": "Trial Users",
            "broadcasts": [
                {
                    "from": "onboarding@resend.dev",
                    "subject": "Getting Started with Your Free Trial",
                    "name": "Trial Onboarding Sequence",
                    "html": "<h1>Welcome to Your Free Trial!</h1><p>Let's get you started with some helpful resources...</p><div><h3>Quick Start Guide</h3><ol><li>Complete your profile</li><li>Explore the dashboard</li><li>Try our key features</li></ol></div>",
                    "text": "Welcome to Your Free Trial! Quick Start Guide: 1) Complete your profile 2) Explore the dashboard 3) Try our key features",
                    "status": "draft"
                }
            ]
        }
    ]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    contacts: [
      {
        email: 'robert.johnson@techcorp.com',
        first_name: 'Robert',
        last_name: 'Johnson',
        unsubscribed: false
      },
      {
        email: 'maria.garcia@innovate.io',
        first_name: 'Maria',
        last_name: 'Garcia',
        unsubscribed: false
      },
      {
        email: 'david.lee@startup.com',
        first_name: 'David',
        last_name: 'Lee',
        unsubscribed: false
      }
    ],
    segments: [
      {
        name: 'Premium Customers',
        broadcasts: [
          {
            from: 'onboarding@resend.dev',
            subject: 'Exclusive Premium Member Benefits This Month',
            name: 'Premium Benefits December',
            html: '<h1>Premium Member Exclusive</h1><p>As a valued premium member, enjoy these exclusive benefits this month...</p><ul><li>20% off all products</li><li>Early access to new features</li><li>Priority support</li></ul>',
            text: 'Premium Member Exclusive - Enjoy 20% off all products, early access to new features, and priority support this month.',
            status: 'draft'
          }
        ]
      },
      {
        name: 'Newsletter Subscribers',
        broadcasts: [
          {
            from: 'onboarding@resend.dev',
            subject: 'ACME Monthly Newsletter - December 2025',
            name: 'December Newsletter',
            html: '<div><h1>December Newsletter</h1><h2>What\'s New This Month</h2><p>Here are the highlights from December...</p><ul><li>Product updates</li><li>Customer success stories</li><li>Upcoming events</li></ul></div>',
            text: 'December Newsletter - What\'s New This Month: Product updates, customer success stories, and upcoming events.',
            reply_to: 'feedback@acmecorp.com',
            status: 'draft'
          }
        ]
      },
      {
        name: 'Trial Users',
        broadcasts: [
          {
            from: 'onboarding@resend.dev',
            subject: 'Getting Started with Your Free Trial',
            name: 'Trial Onboarding Sequence',
            html: '<h1>Welcome to Your Free Trial!</h1><p>Let\'s get you started with some helpful resources...</p><div><h3>Quick Start Guide</h3><ol><li>Complete your profile</li><li>Explore the dashboard</li><li>Try our key features</li></ol></div>',
            text: 'Welcome to Your Free Trial! Quick Start Guide: 1) Complete your profile 2) Explore the dashboard 3) Try our key features',
            status: 'draft'
          }
        ]
      }
    ]
  })
};

fetch('https://api.klavis.ai/sandbox/resend/{sandbox_id}/initialize', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    contacts: [
      {
        email: 'robert.johnson@techcorp.com',
        first_name: 'Robert',
        last_name: 'Johnson',
        unsubscribed: false
      },
      {
        email: 'maria.garcia@innovate.io',
        first_name: 'Maria',
        last_name: 'Garcia',
        unsubscribed: false
      },
      {
        email: 'david.lee@startup.com',
        first_name: 'David',
        last_name: 'Lee',
        unsubscribed: false
      }
    ],
    segments: [
      {
        name: 'Premium Customers',
        broadcasts: [
          {
            from: 'onboarding@resend.dev',
            subject: 'Exclusive Premium Member Benefits This Month',
            name: 'Premium Benefits December',
            html: '<h1>Premium Member Exclusive</h1><p>As a valued premium member, enjoy these exclusive benefits this month...</p><ul><li>20% off all products</li><li>Early access to new features</li><li>Priority support</li></ul>',
            text: 'Premium Member Exclusive - Enjoy 20% off all products, early access to new features, and priority support this month.',
            status: 'draft'
          }
        ]
      },
      {
        name: 'Newsletter Subscribers',
        broadcasts: [
          {
            from: 'onboarding@resend.dev',
            subject: 'ACME Monthly Newsletter - December 2025',
            name: 'December Newsletter',
            html: '<div><h1>December Newsletter</h1><h2>What\'s New This Month</h2><p>Here are the highlights from December...</p><ul><li>Product updates</li><li>Customer success stories</li><li>Upcoming events</li></ul></div>',
            text: 'December Newsletter - What\'s New This Month: Product updates, customer success stories, and upcoming events.',
            reply_to: 'feedback@acmecorp.com',
            status: 'draft'
          }
        ]
      },
      {
        name: 'Trial Users',
        broadcasts: [
          {
            from: 'onboarding@resend.dev',
            subject: 'Getting Started with Your Free Trial',
            name: 'Trial Onboarding Sequence',
            html: '<h1>Welcome to Your Free Trial!</h1><p>Let\'s get you started with some helpful resources...</p><div><h3>Quick Start Guide</h3><ol><li>Complete your profile</li><li>Explore the dashboard</li><li>Try our key features</li></ol></div>',
            text: 'Welcome to Your Free Trial! Quick Start Guide: 1) Complete your profile 2) Explore the dashboard 3) Try our key features',
            status: 'draft'
          }
        ]
      }
    ]
  })
};

fetch('https://api.klavis.ai/sandbox/resend/{sandbox_id}/initialize', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "sandbox_id": "<string>",
  "message": "<string>"
}

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}