Withdrawals work in a similar way (as seen in the video below). Click on withdraw, enter the amount you'll withdraw from your "Savings account" to your "Available balance".
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The signature process is the same as when depositing. You'll need to use passkeys via a linked device like a mobile phone.

Select "Use a phone, tablet, or security key" at the bottom of the passkeys pop-up, then scan the QR code with your phone to sign.

You will be required to sign twice, once to approve USD+ to be used, and the other to redeem USD+ for USDC.