[Feature]: Make prepayment of customs fees optional

[jclouter]

Is your feature request related to a problem?

prepayment of fees is always mandatory but should be an optional selection for the customer.

Describe the solution you'd like

Prepayment of customs fees should really be presented as an option, not always mandatory.

Describe alternatives you've considered

No response

Additional context

No response

Before submitting

• I have searched existing issues to ensure this feature hasn't already been requested
• This is a single feature (not multiple features in one request)