Book shop payment form
There's 2 forms:
The first has all the items and you click on them and the form tallies up the price. This is useful to avoid making mistakes but it’d be a big form – and problematic if someone wants to purchase two of something. Could work around that I suppose.
Itemised booking form
The second one has fields to enter the details and then you simply enter the value in the 'price' field and that's it. More vulnerable to pricing error but much simpler.
General booking form
Bear in mind that if you go through PayPal they charge per transaction. For a fee of $35 we get charged $1.35.