Good day, k1t2.
There are two options on how you can enter your Paypoint sales in QBO.
First is to manually record them. Here's how:
Second option is to import a number or transactions using a csv file. You can get a copy of the file from the bank where your Paypoint sales are deposited.
Please open this article where you can get more details how this feature works: Import bank transactions using Excel CSV files.
I'll be around if you need anything else.