curl -X PATCH "https://api.affonso.io/v1/program/notifications/nt_welcome" \
  -H "Authorization: Bearer sk_live_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "is_active": true,
    "custom_subject": "Welcome to the Acme affiliate family!"
  }'

{
  "success": true,
  "data": {
    "id": "ns_abc123",
    "email_type_id": "nt_welcome",
    "is_active": true,
    "custom_subject": "Welcome to the Acme affiliate family!",
    "custom_body": null,
    "type": {
      "name": "Welcome Email",
      "description": "Sent when an affiliate is approved",
      "icon": "mail",
      "is_customizable": true,
      "target_audience": "affiliate"
    }
  }
}