CODE
    private function setShippingAddress(&$fields, $id_address)
    {
        $address = new Address($id_address);

        //We allow address modification when using express checkout shortcut
        if ($this->type != 'payment_cart') {
            $fields['ADDROVERRIDE'] = '0';
            $fields['NOSHIPPING'] = '0';
        } else {
            $fields['ADDROVERRIDE'] = '1';
        }

        $fields['EMAIL'] = $this->context->customer->email;
        $fields['PAYMENTREQUEST_0_SHIPTONAME'] = trim($address->firstname . ' ' . $address->lastname);
        $fields['PAYMENTREQUEST_0_SHIPTOPHONENUM'] = (empty($address->phone)) ? $address->phone_mobile : $address->phone;
        $fields['PAYMENTREQUEST_0_SHIPTOSTREET'] = !empty($address->address1) ? trim($address->address1) : '';
        $fields['PAYMENTREQUEST_0_SHIPTOSTREET2'] = !empty($address->address2) ? trim($address->address2) : '';
        $fields['PAYMENTREQUEST_0_SHIPTOCITY'] = !empty($address->city) ? trim($address->city) : '';

        $country = new Country((int) $address->id_country);
        if ($address->id_state) {
            $state = new State((int) $address->id_state);
            $fields['PAYMENTREQUEST_0_SHIPTOSTATE'] = $state->iso_code;
        } else {
            $fields['PAYMENTREQUEST_0_SHIPTOSTATE'] = $country->iso_code;
        }
        $fields['PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE'] = $country->iso_code;
        $fields['PAYMENTREQUEST_0_SHIPTOZIP'] = !empty($address->postcode) ? trim($address->postcode) : '';
    }