Your WhatsApp agent.
Now with webhooks.

Rust

let sent = client
    .post(format!("{base}/v1/agents/{agent_id}/messages"))
    .bearer_auth(api_key)
    .json(&json!({ "to": sender, "text": "Hello!" }))
    .send().await?
    .json::<Value>().await?;

Python

sent = requests.post(
    f"{base}/v1/agents/{agent_id}/messages",
    headers={"Authorization": f"Bearer {api_key}"},
    json={"to": sender, "text": "Hello!"},
).json()

Go

payload, _ := json.Marshal(map[string]string{"to": sender, "text": "Hello!"})
req, _ := http.NewRequest("POST", url, bytes.NewReader(payload))
req.Header.Set("Authorization", "Bearer "+apiKey)
req.Header.Set("Content-Type", "application/json")
response, _ := client.Do(req)

Node.js

const response = await fetch(url, {
  method: "POST",
  headers: { Authorization: `Bearer ${apiKey}`,
             "Content-Type": "application/json" },
  body: JSON.stringify({ to: sender, text: "Hello!" }),
});
const { message_id } = await response.json();

cURL

curl "$BASE_URL/v1/agents/$AGENT_ID/messages" \
  -H "Authorization: Bearer $UNPOLL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to":"user:50972923564215","text":"Hello!"}'