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3 instalment options with different pricing for members vs. non-members

If required, the price can be set to 'open' to allow the payer to enter their own amount

A simple matrix can be used where you have only one variable.  It allows unlimited rows with a 20 character limit for each row's description

2 Products - one with VAT for UK customers, one without for overseas customers.

In this example there are different postage options available.