You can use changeNOW to purchase Ariva coin:
Pick the currency you want to use to buy ARV. Choose ARV from the drop-down menu and press “Buy.” Specify the sum of ARV you wish to buy. Enter your Ariva crypto public address to which you would like to receive your coins and press “Next.” Choose your preferred payment method and conduct the transaction. Once the transaction is finalized, your ARV coins will be sent to you.