Vendor Commission based on Category fixed price

gistfile1.php

<?php 
add_filter( 'wcv_commission_rate', 'my_wcv_commission_rate', 10, 4 );

function my_wcv_commission_rate( $commission, $product_id, $product_price, $order ) {
 	
    $terms = get_the_terms( $product_id, 'product_cat' );
        
    // Loop through the categories 
    // It will break on the first category assigned 
	foreach ( $terms as $term ) {
	    	switch ( strtolower( $term->name ) ) {
	    		case 't-shirts':
	    			$commission = $product_price - 12; 
	    			break;
	    		case 'canvas':
	    			$commission = $product_price - 10; 
	    			break;
	    		case 'hats':
	    			$commission = $product_price - 17; 
	    			break;
	    		case 'hoodies':
	    			$commission = $product_price - 26; 
	    			break;
	    		// Some default if it fails all the above. 
	    		default:
	    			$commission = $product_price - 2; 
	    			break;
	    	}
	}
	
    return round( $commission, 2 );
}

Please let me know how to implement this in wcvendor local installation with latest version

Easy, just add it to your themes functions.php file. :)