Send document

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": "document",
  "document": {
    "link": "https://example.com/invoice.pdf",
    "filename": "invoice.pdf",
    "caption": "March invoice"
  }
}'