GetZipCodesForFips

// https://pav3.esendex.us/PavService.svc?wsdl was added as a Service Reference and given the name WSDL

using System;
using WSDL;

var config = PavServiceClient.EndpointConfiguration.pavws_secure;
var client = new PavServiceClient(config);
var fips = "51550";
var licenseKey = "YOUR_LICENSE_KEY";
var response = await client.GetZipCodesForFipsAsync(fips, licenseKey);

var returnCodeDescription = response.ReturnCode switch
{
    0 => "Success",
    1 => "Invalid input",
    2 => "Invalid license key",
    3 => "Returned 0 ZIP Codes (no matches)",
    4 => "Outside of latitude/longitude range",
    _ => "Unknown return code"
};

Console.WriteLine($"Return Code: {response.ReturnCode} - {returnCodeDescription}");

if (response.ZipCodes is not null)
{
    foreach (var zip in response.ZipCodes)
    {
        Console.WriteLine($"ZIP Code: {zip}");
    }
}

Console.ReadLine();

const params = new URLSearchParams({
    'Fips': '51550',
    'LicenseKey': '00000000-0000-0000-0000-000000000000'
});

const url = 'https://pav3.esendex.us/PavService.svc/GetZipCodesForFips?' + params.toString();

const options = {
    headers: {
        'Accept': 'application/json'
    }
};

const response = await fetch(url, options);
const json = await response.json();

console.log(json);

<?php
$client = new SoapClient('https://pav3.esendex.us/PavService.svc?wsdl');
$param = array(
  'Fips' => '51550'
  , 'LicenseKey' => 'YOUR LICENSE KEY'
);
$result = $client->GetZipCodesForFips($param);

echo "<pre>";
print_r($result);
echo "</pre>";
?>

import httpx

headers = {"Accept": "application/json"}
url = "https://pav3.esendex.us/PavService.svc/GetZipCodesForFips"

request = {
    "Fips": "51550",
    "LicenseKey": "00000000-0000-0000-0000-000000000000",
}

with httpx.Client(headers=headers) as client:
    response = client.get(url=url, params=request)

response.raise_for_status()

print(response.json())

require 'json'
require 'net/http'

headers = { Accept: 'application/json', 'Content-Type': 'application/json' }
uri = URI('https://pav3.esendex.us/PavService.svc/GetZipCodesForFips')

params = {
  'Fips': '51550',
  'LicenseKey': '00000000-0000-0000-0000-000000000000'
}

uri.query = URI.encode_www_form(params)
response = Net::HTTP.get(uri, headers)
raise response.message if response.is_a?(Net::HTTPClientError) || response.is_a?(Net::HTTPServerError)

puts JSON.parse(response)

{
  "ReturnCode": 0,
  "ZipCodes": [
    "23320",
    "23321",
    "23322",
    "23323",
    "23324",
    "23325",
    "23326",
    "23327",
    "23328"
  ]
}

<ZipCodesResponse xmlns="pav3.esendex.us" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <ReturnCode>0</ReturnCode>
  <ZipCodes xmlns:a="http://schemas.microsoft.com/2003/10/Serialization/Arrays">
    <a:string>23320</a:string>
    <a:string>23321</a:string>
    <a:string>23322</a:string>
    <a:string>23323</a:string>
    <a:string>23324</a:string>
    <a:string>23325</a:string>
    <a:string>23326</a:string>
    <a:string>23327</a:string>
    <a:string>23328</a:string>
  </ZipCodes>
</ZipCodesResponse>