When you add funds to your Slide Balance using BitPay, you will be redirected to BitPay’s mobile app. Then you can select the wallet and cryptocurrency you would like to pay with, input the exact crypto amount that is listed on the invoice in your wallet, or copy the Payment Protocol URI if you are using a Payment Protocol compatible wallet. When you create a BitPay invoice, it is valid for 15 minutes. If the invoice expires, please try depositing funds into your Slide Balance again. Please visit BitPay’s support center for more information.