Conditional formatting using Eway payments

Can you setup conditional formatting so depending on a what field you choose on your form will show a different price in the Payment Gateway (Eway)

ie:

Member price 'A' show $10

Member price 'B' shows $20

I have about 30 different price points however only want to show the relevant ones.

Yes this can be achieved using Form Calculation widget and Conditions.

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget

https://www.jotform.com/answers/792592-Using-conditions-in-the-calculation-widget

To pass calculation field value to payment widget, follow the tutorial provide at the link below:

https://www.jotform.com/help/275-How-to-Pass-a-Calculation-to-a-Payment-Field

Hope this helps.