minimum order value

There isn’t an option built into the plugin to prevent redeeming a gift card until a certain amount has been added to the cart, however you could accomplish this using custom code with the pwgc_gift_card_can_be_redeemed hook:

For example:

1. Download the free Code Snippets plugin: https://ww.wp.xz.cn/plugins/code-snippets/
2. Create a new Snippet with the following code (you can add the snippet to your functions.php instead of using Code Snippets if you are more familiar with that):

function custom_pwgc_git_card_can_be_redeemed( $message, $gift_card ) {
    $gift_card_allowed = true;

    //
    // Here is where you need to write code to determine
    // if the cart will allow a gift card to be redeemed.
    //

    if ( ! $gift_card_allowed ) {
        $message = 'Gift cards cannot be used until order total is greater than $x.';
    }

    return $message;
}
add_filter( 'pwgc_gift_card_can_be_redeemed', 'custom_pwgc_git_card_can_be_redeemed', 10, 2 );