You can transfer that money to your Cash App account if you've purchased a gift card. To do so, visit the Cash App website. You'll be asked to provide some information to complete the transfer. Alternatively, you can use a service like PayPal to add the money from the gift card to your Cash App account:

First, you'll need to log in to PayPal.
After you've signed in, you'll be presented with your PayPal balance. Choose the 'Link a card option.
Enter the card's number and security code and click "Link Card."
You can then send money from your PayPal account to your Cash App account.

Once your payment has been processed, you can easily transfer money from gift card to Cash App. If you're unsure of the date when the transfer will occur, check with your bank. Depending on your bank, it can take up to three business days.