My evoucher expires within the next month. What happens if I book a REFUNDABLE flight (Economy Flexible) using my evoucher for partial payment, credit card for remaining payment and later have to cancel the flight?

Will I get back the value of the evoucher in another voucher? If so, what would be the expiration date of the new voucher and would it be paper or evoucher?

Does it make a difference if the flight cancellation occurs before or after the expiration date on the evoucher?

What form would I get the money I paid with credit card back in? Back to credit card or just credit for a future trip?