You want customers to choose a package and pay from WhatsApp without opening another app, the way WACO renews itself.

WACO renews its own subscriptions over WhatsApp (see the guide). That flow is built from four ingredients that are all available to you through the API, nothing proprietary.

Ingredients

• Webhook message.received: the customer's message reaches your system with the sender number (your key to identify the account) and, for button/list replies, pesan.pilihan = {id, judul}.
• POST /api/v1/tombol: a message with 1–3 reply buttons (title ≤20 characters, any id).
• POST /api/v1/daftar: a list message with up to 10 rows, for more packages or picking an account.
• POST /api/v1/kirim-media with tipe: "image" and the URL of the QR image you generate (QRIS from your payment gateway, or any payment code), then POST /api/v1/balas for free text such as the paid confirmation. All are session messages: valid for 24 hours after the customer's last message.

The flow

1. The webhook receives {"pesan":{"teks":"perpanjang"},"dari":"628…"}. Your system looks up the account by number.
2. Offer packages:

   POST /api/v1/tombol
   {"nomor":"628111222333",
    "judul":"Renew subscription",
    "teks":"Account: Toko Maju
   Active until 30 September 2026
   
   Pick a package:",
    "tombol":[{"id":"paket:1","judul":"1 month Rp200k"},
              {"id":"paket:6","judul":"6 months Rp1.1M"},
              {"id":"paket:12","judul":"12 months Rp2M"}]}

3. The webhook receives the reply: "pesan":{"tipe":"interactive","pilihan":{"id":"paket:6","judul":"6 months Rp1.1M"}}. Your system creates the invoice and QR at your payment gateway and places the QR image at a public https URL (tokenised and expiring is fine).
4. Send the QR:

   POST /api/v1/kirim-media
   {"nomor":"628111222333","tipe":"image",
    "url":"https://app.example.com/qr/inv-2026-0912.png",
    "caption":"6-month package. Rp 1,221,000 incl. VAT. Valid 30 minutes."}

5. When your payment gateway reports the payment, confirm it:

   POST /api/v1/balas
   {"nomor":"628111222333","teks":"Payment received. Subscription active until 31 March 2027. Thank you!"}