The amount on the Visa gift card must cover the entire purchase or it will be declined. You can add money to your PayPal account from your bank account first (can't use debit or credit card), and at checkout, pay with your PayPal balance and then see if it lets you select your added and confirmed Visa gift card as back up to your PayPal Balance. Your backup payment method can be a linked bank account, debit or credit card, or PayPal credit product so not sure it will work with Visa prepaid gift card.
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