POST {baseUrl}/ilink/bot/getconfig
Headers:
 Content-Type: application/json
 AuthorizationType: ilink_bot_token
 Authorization: Bearer {bot_token}
 X-WECHAT-UIN: {base64(randomUint32())}
Body:
{
 "ilink_user_id": "{user_id}", // ⚠️ REQUIRED — omitting this returns ret:-2
 "base_info": { "channel_version": "2.0.1" }
}
Response:
{
 "ret": 0,
 "typing_ticket": "AARTBK8FAAAB..."
}

POST {baseUrl}/ilink/bot/sendtyping
Body:
{
 "ilink_user_id": "{user_id}", // ⚠️ REQUIRED here too
 "to_user_id": "{user_id}",
 "typing_ticket": "{ticket}",
 "command": 1, // 1 = show typing, 2 = cancel
 "base_info": { "channel_version": "2.0.1" }
}
Response:
{ "ret": 0 }

// Typing ticket cache
let typingTicket: string | null = null;
let typingTicketExpiry = 0;
async function ensureTypingTicket(
 baseUrl: string, token: string, userId: string
): Promise<string | null> {
 if (typingTicket && Date.now() < typingTicketExpiry) return typingTicket;
 const res = await fetch(`${baseUrl}/ilink/bot/getconfig`, {
 method: 'POST',
 headers: buildIlinkHeaders(token),
 body: JSON.stringify({
 ilink_user_id: userId,
 base_info: { channel_version: '2.0.1' },
 }),
 });
 const data = await res.json();
 if (data.typing_ticket) {
 typingTicket = data.typing_ticket;
 typingTicketExpiry = Date.now() + 20 * 3600_000;
 return typingTicket;
 }
 return null;
}
async function sendTyping(
 baseUrl: string, token: string, userId: string, command: 1 | 2 = 1
) {
 const ticket = await ensureTypingTicket(baseUrl, token, userId);
 if (!ticket) return;
 await fetch(`${baseUrl}/ilink/bot/sendtyping`, {
 method: 'POST',
 headers: buildIlinkHeaders(token),
 body: JSON.stringify({
 ilink_user_id: userId,
 to_user_id: userId,
 typing_ticket: ticket,
 command,
 base_info: { channel_version: '2.0.1' },
 }),
 });
}

// When a message arrives:
await sendTyping(baseUrl, token, userId, 1); // Show typing
// Process with AI...
const response = await queryAI(message);
await sendTyping(baseUrl, token, userId, 2); // Cancel typing
await sendMessage(baseUrl, token, userId, response);