amount variable from conditions

Hi,

I have a form that visitors use to determine the final amount themselves. For example, there are four products with a fixed price. They can specify how many copies of each product they want.

So there is a different price for every visitor. The name for identifying the total field is ‘total-amount’.

Is it possible to include ‘total-amount’ in ‘mollie for contact form 7’. In other words: how can I include the different amounts per form in the payment-string.