You may use a similar method if you have several products but they are all unique. For example, you are selling a yoga class but each class is priced differently, depending on the time of day.
If this is the case, you select block PL100 from the Tariffs category, then add links to each button. For example, for the first button add this link: #price:Morning Class =100 and for the second button: #price:Evening Class =120
When your customer clicks the appropriate payment button, they will be taken to a payment system where they'll be able to pay the correct price.