add_filter( 'woocommerce_available_payment_gateways', 'payment_gateway_disable_private' );

 function payment_gateway_disable_private( $available_gateways ) {
   if ( isset( $available_gateways['authorize'] ) && $woocommerce->customer->get_role($role) <> 'Company' ) {
      unset( $available_gateways['authorize'] );
   } else if ( isset( $available_gateways['cheque'] ) && $woocommerce->customer->get_role($role) == 'Customer' ) {
      unset( $available_gateways['cheque'] );
}
   return $available_gateways;
}