<?php

add_filter( 'wc_shipment_tracking_get_providers', 'custom_shipment_tracking' );

function custom_shipment_tracking( $providers ) {

	unset($providers['Australia']);
	unset($providers['Austria']);
	unset($providers['Brazil']);
	unset($providers['Belgium']);
	unset($providers['Canada']);
	unset($providers['Czech Republic']);
	unset($providers['Finland']);
	unset($providers['France']);
	unset($providers['Germany']);
	unset($providers['Ireland']);
	unset($providers['Italy']);
	unset($providers['India']);
	unset($providers['Netherlands']);
	unset($providers['Romania']);
	unset($providers['South African']);
	unset($providers['Sweden']);
	unset($providers['New Zealand']);
	unset($providers['United Kingdom']);
	unset($providers['United States']['FedEx Sameday']);
	unset($providers['United States']['UPS']);
	unset($providers['United States']['OnTrac']);
	unset($providers['United States']['DHL US']);

	return $providers;
}

add_filter( 'woocommerce_shipment_tracking_default_provider', 'custom_woocommerce_shipment_tracking_default_provider' );

function custom_woocommerce_shipment_tracking_default_provider( $provider ) {
	$provider = 'fedex'; // Replace this with the name of the provider. See line 42 in the plugin for the full list.

	return $provider;
}