We always check reviews from other verified players when testing any gambling site. When it comes to BetOnline, the online reviews are pretty good across the board. BetOnline has a higher average rating at most user-review websites than most gambling platforms out there.
Betfair is also PCI certified and, as a Level 1 merchant, we undergo annual PCI validation by an external and independent PCI Qualified Security Assessor (QSA). You can have confidence that your payment card details are stored and used securely.