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The amount field in your Payment field can capture information from a Form Calculation widget.
So what you will need to do is add a Form Calculation widget
And then configure your Form Calculation widget to get the amount or the value from the field you wish, or even calculate a value based on different fields by adding the fields (and the formula for your calculation if necessary)
Note: You can also set this field as hidden
Next, open the wizard of your Payment field and then go to the bottom. Select the Form Calculation widget that you have added in Get price From option
Once done, just save the settings and to be sure, save the form.
Thanks very much! I had completely forgotten about the widget and was thinking the form calculation was enough. Hooray!!