If the price you paid was lower than your voucher's value, said voucher is still valid for the amount left.
Example:
- XXXXXX voucher of 10 €
- reservation paid 5 €
Your voucher is still valid for 5€.
For your information :
- The period of validity remains the same as originally stated when you received the voucher.
- You must travel during the validity period of the voucher.