Make fields required

functions.php

<?php 

// You will also have to modify the store-settings.php template in templates/dashboard/store-settings.php 
// Line 20 replace the form start with this 
// <form method="post" action="" class="wcv-form wcv-formvalidator">
//do this in the core file not an override as this was missed and I've added it to core and will be upgrade safe next time 

// Paypal required 
function wcv_paypal_required( $args ){ 

	$custom_attributes = array( 
		'data-rules' => 'required', 
		'data-error' => __( 'Paypal address is required', 'wcvendors-pro' ), 
	); 

	$args['label'] = 'Something Else'; 
	$args['custom_attributes'] = $custom_attributes; 

	error_log( print_r( $args, true ) ); 

	return $args; 
	
} // wcv_paypal_required() 
add_filter( 'wcv_vendor_paypal_address', 'wcv_paypal_required' ); 

// Price required
function wcv_price_required( $args ){ 

	$args['custom_attributes']['data-rules'] = 'required|decimal'; 
	$args['custom_attributes']['data-error'] =__( 'Price is required and should be a number.', 'wcvendors-pro' ); 
	return $args; 

} // wcv_price_required() 
add_filter( 'wcv_product_price', 'wcv_price_required' );

// National Shipping required 
function wcv_national_shipping_required( $args ){ 

	$custom_attributes = array( 
		'data-rules' => 'required|decimal', 
		'data-error' => __( 'National shipping is required.', 'wcvendors-pro' ), 
	); 

	$args['custom_attributes'] = $custom_attributes; 

	return $args; 
	
} // wcv_national_shipping_required() 
add_filter( 'wcv_product_shipping_fee_national', 'wcv_national_shipping_required' ); 

Awesome! Just what I was looking for! Thanks :)