The Currensea Pro plan costs £39.95 a year, which is collected via your Currensea Direct Debit. If your payment is not successful then your card will be frozen and you will not receive the benefits until you have paid the subscription fee.
If you were an existing Currensea Premium customer before it rebranded to Currensea Pro, the price change will come into effect upon your next renewal date and you will not be required to pay anything extra before then.