Authorization: Imagine you’re about to take an Uber, and they don’t know how much you’ll be charged. They’ll put a $10 “hold” on your account until your trip is done, then they’ll actually charge your account. This is called an “Authorization”
Capture: When Uber actually charges you. This is the actual money that moves out of your Float account.
Top up: Money being added into Float from your bank account
Refund: Money being refunded from Float to your account