Card transactions are rejected when you try to spend more funds from your CoinZoom Visa Crypto Debit card than is currently available in your Spend wallet.
After two rejections in a month, we will send you an email reminding you to add funds to your Spend wallet. After 6 rejections, we will begin charging a $0.50 fee for each one to cover the costs CoinZoom is charged by the bank.
To update your Spend wallet, you either need to change the wallet to another currency with more funds or add more funds to that wallet. Please see this article on Configuring Your Spend Wallet.