Pay Your Invoice To pay your invoice with P3C Technologies via your Credit Card or PayPal account, review the instructions below. We recommend printing this page for the first time you pay via credit card. Enter your invoice ID: 1. Find your invoice ID on your invoice from P3C Technologies. 2. Enter your invoice ID in the form provided on this page above and click “Pay Now”, you will be taken to the PayPal site (shown below) where you will need to fill in the amount of your invoice in the “Item Price” field. Follow the remaining instructions shown in the screen shot below to fill in your contact information and continue.