Send sticker

curl -X POST "https://gateway.hookmyapp.com/meta/v22.0/${WHATSAPP_PHONE_NUMBER_ID}/messages" \
  -H "Authorization: Bearer ${WHATSAPP_ACCESS_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
  "messaging_product": "whatsapp",
  "to": "15551234567",
  "type": "sticker",
  "sticker": {
    "link": "https://example.com/sticker.webp"
  }
}'