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USPS: Add Envelope as a service
* Add letters and envelopes to international services.
add_filter( 'wc_usps_services', function( $services ) {
$services['I_FIRST_CLASS']['services']['13'] = "First Class Mail® International Letters";
$services['I_FIRST_CLASS']['services']['14'] = "First Class Mail® International Large Envelope";
return $services;
} );
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