Payment We make it easy. You can pay your invoice at the time of service with cash or check, through Venmo or our online payment form. Now accepting payment through Venmo. To pay your invoice through Venmo simply take a picture of the QR Code below or open your Venmo App and search for @cullinanirrigation. Pay invoice online using our online payment form. Click the button to pay your invoice through our online payment form. We also accept Check Cards or Debit Cards.