Add Fees on Payment Method

add_action( 'woocommerce_cart_calculate_fees', 'payment_fees' );
function payment_fees ( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $chosen_payment_id = WC()->session->get('chosen_payment_method');

    if ( empty( $chosen_payment_id ) )
        return;

    $subtotal = $cart->cart_contents_total + $cart->shipping_total ;

    // SETTINGS: Here set in the array the (payment Id) / (fee cost) pairs
    $targeted_payment_ids = array(
        'ppcp-gateway' => ((6.5 * $subtotal / 100)+1)* 1.05  , // Percentage fee
        'ppcp-card-button-gateway' => ((6.5 * $subtotal / 100)+1)* 1.05  , // Percentage fee
        'stripe' => ((3.9 * $subtotal / 100)+1)* 1.05  , // Percentage fee
        'cod' => ((3 * $subtotal / 100)+0.2)* 1.05  , // Percentage fee
        'wallet' => ((2.9 * $subtotal / 100)+0.1)* 1.05  , // Percentage fee
        'bacs' => ((2.99 * $subtotal / 100)+1)* 1.05  , // Percentage fee
    );

    // Loop through defined payment Ids array
    foreach ( $targeted_payment_ids as $payment_id => $fee_cost ) {
        if ( $chosen_payment_id === $payment_id ) {
            if ($payment_id === 'cod' || $payment_id === 'wallet') {
                $cart->add_fee( __('Handling & Service Fees', 'woocommerce'), $fee_cost, true );
            } else {
                $cart->add_fee( __('Payment Fees', 'woocommerce'), $fee_cost, true );
            }
        }
    }
}