Customize woocommerce price in product, cart, category and checkout pages

// Alter Product Pricing Part 1 - WooCommerce Product


 
add_filter( 'woocommerce_get_price_html', 'bbloomer_alter_price_display', 9999, 2 );

function bbloomer_alter_price_display( $price_html, $product ) {
    
    // ONLY ON FRONTEND
    if ( is_admin() ) return $price_html;
    
    // ONLY IF PRICE NOT NULL
    if ( '' === $product->get_price() ) return $price_html;
    
    // IF CUSTOMER LOGGED IN, APPLY 20% DISCOUNT   
    if ( wc_current_user_has_role( 'customer' ) ) {
        $orig_price = wc_get_price_to_display( $product );
        $price_html = wc_price( $orig_price * 0.80 );
    }
    
    return $price_html;
 
}
 
// Alter Product Pricing Part 2 - WooCommerce Cart/Checkout

 
add_action( 'woocommerce_before_calculate_totals', 'bbloomer_alter_price_cart', 9999 );
 
function bbloomer_alter_price_cart( $cart ) {
 
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) return;
 
    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 ) return;
 
    // IF CUSTOMER NOT LOGGED IN, DONT APPLY DISCOUNT
    if ( ! wc_current_user_has_role( 'customer' ) ) return;
 
    // LOOP THROUGH CART ITEMS & APPLY 20% DISCOUNT
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
        $product = $cart_item['data'];
        $price = $product->get_price();
        $cart_item['data']->set_price( $price * 0.80 );
    }
 
}