List recent completed voicegrams

{
  "voicegrams": [
    {
      "event": "voicegram.completed",
      "event_id": "evt_sample-12345678",
      "delivered_at": "2026-05-14T19:23:45.000Z",
      "data": {
        "id": "vg_sample_12345678",
        "created_at": "2026-05-13T19:22:00.000Z",
        "completed_at": "2026-05-13T19:23:00.000Z",
        "duration_seconds": 47,
        "sender": {
          "verification_method": "email",
          "email": "sample.customer@example.com",
          "phone": null,
          "whatsapp": null
        },
        "channel": {
          "type": "domain",
          "id": "sample-domain-id",
          "name": "example.com",
          "page_url": "https://example.com/pricing"
        },
        "transcript": {
          "text": "Hi, I wanted to ask about your enterprise pricing options. Please call me back at four one five, five five five, oh one two three or email pricing.questions@example.com. Thanks.",
          "confidence": 0.94
        },
        "summary": {
          "text": "Customer asking about enterprise pricing. Wants a callback or follow-up email.",
          "urgency": "medium",
          "sentiment": "neutral",
          "intent": "inquiry",
          "callback_required": true,
          "action_items": [
            {
              "task": "Send enterprise pricing details",
              "priority": "medium",
              "deadline": null
            },
            {
              "task": "Call back at +14155550123",
              "priority": "medium",
              "deadline": null
            }
          ],
          "mentioned": {
            "names": [
              "Example Corp"
            ],
            "phones": [
              "+14155550123"
            ],
            "emails": [
              "pricing.questions@example.com"
            ]
          }
        },
        "audio": {
          "url": "https://www.voicegram.io/api/listen/vg_sample_12345678?t=sample-token-redacted",
          "expires_at": "2026-05-15T19:23:45.000Z",
          "content_type": "audio/webm"
        },
        "dashboard_url": "https://voicegram.io/dashboard/inbox/vg_sample_12345678",
        "tags": [
          "pricing",
          "enterprise"
        ]
      }
    },
    {
      "event": "voicegram.completed",
      "event_id": "evt_sample-87654321",
      "delivered_at": "2026-05-14T20:10:00.000Z",
      "data": {
        "id": "vg_sample_87654321",
        "created_at": "2026-05-14T20:08:30.000Z",
        "completed_at": "2026-05-14T20:09:15.000Z",
        "duration_seconds": 22,
        "sender": {
          "verification_method": "sms",
          "email": null,
          "phone": "+12125550148",
          "whatsapp": null
        },
        "channel": {
          "type": "domain",
          "id": "sample-domain-id",
          "name": "example.com",
          "page_url": "https://example.com/contact"
        },
        "transcript": {
          "text": "Hi, it is Jordan. My order has not arrived yet and I need it by Friday. Could someone call me back? Thanks.",
          "confidence": 0.97
        },
        "summary": {
          "text": "Jordan reports a late order needed by Friday and requests a callback. The callback number is the verified sender phone.",
          "urgency": "high",
          "sentiment": "frustrated",
          "intent": "support",
          "callback_required": true,
          "action_items": [
            {
              "task": "Call Jordan back about the late order",
              "priority": "high",
              "deadline": null
            }
          ],
          "mentioned": {
            "names": [
              "Jordan"
            ],
            "phones": [],
            "emails": []
          }
        },
        "audio": {
          "url": "https://www.voicegram.io/api/listen/vg_sample_87654321?t=sample-token-redacted",
          "expires_at": "2026-05-16T20:10:00.000Z",
          "content_type": "audio/webm"
        },
        "dashboard_url": "https://voicegram.io/dashboard/inbox/vg_sample_87654321",
        "tags": [
          "order",
          "callback"
        ]
      }
    }
  ]
}