List senders

Example response

{
  "items": [
    {
      "id": "sender_12345",
      "name": "Primary sender",
      "phoneNumber": "+13125551212",
      "channels": [
        "sms",
        "voice"
      ],
      "webhook": {
        "url": "https://api.example.com/webhooks/zavu",
        "secret": "whsec_abc123..."
      },
      "whatsapp": {
        "displayPhoneNumber": "+14155551234",
        "paymentStatus": {
          "setupStatus": "COMPLETE",
          "methodStatus": "VALID"
        }
      },
      "emailAddress": "noreply@yourdomain.com"
    }
  ]
}