Create a sandbox session

curl --request POST \
  --url https://app.kapso.ai/api/v1/sandbox_sessions \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '{
  "whatsapp_sandbox_session": {
    "phone_number": "+12345678901",
    "agent_id": "123e4567-e89b-12d3-a456-426614174000"
  }
}'

{
  "data": {
    "id": "123e4567-e89b-12d3-a456-426614174000",
    "phone_number": "+12345678901",
    "status": "pending_activation",
    "activation_code": "ABC123",
    "activation_message": "Your WhatsApp Sandbox activation code is: ABC123",
    "activation_link": "https://wa.me/12345678901?text=ABC123",
    "activated_at": "2023-11-07T05:31:56Z",
    "expires_at": "2023-11-07T05:31:56Z",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "agent": {
      "id": "agent-123abc",
      "name": "Customer Support Agent",
      "description": "Handles initial customer support queries",
      "project_id": "project-456def",
      "created_at": "2023-11-07T05:31:56Z",
      "updated_at": "2023-11-07T05:31:56Z"
    }
  }
}