Additionally, site admins can now customize methods and gateways available to customers checking out as WooCommerce ‘guests.’ When using custom roles,
The WooCommerce Role Based Methods extension makes it easy to Taylor shipping methods and payment gateways for customers large and small.
Limit different user roles to specific payment / shipping methods
WooCommerce Role-Based Methods extension gives site administrators the ability to individually limit available Shipping Methods and Payment Gateways for each user role configured in WordPress.