Nowa Power Products now offers Afterpay, Humm little things & Zip Pay in store! Afterpay, Humm little things & Zip Pay are available on purchases where the total invoice is $2,000 or under.* To sign up for these services, use your devices app store to download the application to your mobile device, then follow the prompts within. Once signed up to Afterpay, Humm little things or Zip Pay, simply bring your device into store to make your purchase.