json POST

If it's jQuery and an ajax POST should be something like:

$.ajax({
type:'POST',
url: 'https://securegateplus.nmp.neuroticmedia.net/Customer/Register',
data: {"customer": { "UserName" : "testers@neuroticmedia.com" }},
success: function(){ // handle success },
error: function(){ // handle error }
})

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Otherwise (and I'm not a PHP guy) but the idea should be the same as any other <form> POST.

<form action="https://securegateplus.nmp.neuroticmedia.net/Customer/Register" method="post">
        <input name="customer.UserName" type="text" value="testers@neuroticmedia.com" />
        <input name="mySubmit" type="submit" value="submit" />
</form>

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Do you have the documentation that tells what to send to the API?  If so, please post it here or post a link to it, thanks.

You'll only be able to do it with jQuery if the remote server supports JSONP (if not you could push it through a proxy), but as Ray says, without documentation we'll be guessing all day long.

As for PHP, you're probably best off looking a cURL.

We're gonna need more info

Here is the API..I am working off of page 10 right now..

forgot to attach...Here it is...Thanks
Neurolinq-Plus-API-v1.1--1-.pdf

Sorry, I just don't have time to read a 62-page API manual.  Is there any kind of a "quickstart" guide or another way we could get to the SSCCE?

Sorry .thanks for the help..But I am not asking you to read to 62 pages...I am just on page 10 trying to get the request on the bottom of page 10 to work..thanks

OK, that shrinks the footprint a bit.  Look at page 1 of the PDF document.  It describes a RESTful access method.  That is what I would recommend.  I'll look at it a little bit more.  While I am doing that, please read this article:
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_12239-Introduction-to-Application-Programming-Interfaces.html

It looks like you would want to make a cURL POST-method request to this URL:
https://securegateplus.nmp.neuroticmedia.net/Customer/Register

I can't test this, but it may help to get you started.  You might also want to consider fsockopen() to communicate with the API.

<?php // RAY_curl_post_async.php
error_reporting(E_ALL);


// DEMONSTRATE HOW TO USE CURL POST TO START AN ASYNCHRONOUS PROCESS


function curl_post
( $url
, $header
, $post_string
, $timeout=2
, $error_report=FALSE
)
{
    // PREPARE THE CURL CALL
    $curl = curl_init();
    curl_setopt( $curl, CURLOPT_URL,            $url         );
    curl_setopt( $curl, CURLOPT_HEADER,         $header      );
    curl_setopt( $curl, CURLOPT_POST,           TRUE         );
    curl_setopt( $curl, CURLOPT_POSTFIELDS,     $post_string );
    curl_setopt( $curl, CURLOPT_TIMEOUT,        $timeout     );
    curl_setopt( $curl, CURLOPT_RETURNTRANSFER, TRUE         );

    // EXECUTE THE CURL CALL
    $htm = curl_exec($curl);
    $err = curl_errno($curl);
    $inf = curl_getinfo($curl);

    // ON FAILURE
    if (!$htm)
    {
        // PROCESS ERRORS HERE
        if ($error_report)
        {
            echo "CURL FAIL: $url TIMEOUT=$timeout, CURL_ERRNO=$err";
            echo "<pre>\n";
            var_dump($inf);
            echo "</pre>\n";
        }
        curl_close($curl);
        return FALSE;
    }

    // ON SUCCESS
    curl_close($curl);
    return $htm;
}


// PREPARE THE JSON STRING
$jso = <<<EOD
{
"BillingAddress":
  {
  "AddressName":"Billing",
  "City":"Newnan",
  "PostalCode":"30076",
  "Province":"GA",
  "Street1":"487 Gibson Rd"
  },
"Customer":
  {
  "AgreedTermsDate":"\/Date(1297110939057-0500)\/",
  "CellPhone":"678-777-3454",
  "DateOfBirth":"\/Date(200462400000-0400)\/",
  "FirstName":"Tim",
  "LastName":"Kohler",
  "MerchantID":"28908a45-750c-4ac6-81e3-98d7a0c889b0",
  "Password":"password",
  "UserName":"testers@neuroticmedia.com"
  }
}
EOD;


// PREPARE THE HEADERS
$hdr[] = 'api-key: B6FFF46B-9557-42F0-AB88-2FA53C098E84';
$hdr[] = 'User-Agent: Fiddler'; // NOT SURE IF THIS MATTERS
$hdr[] = 'Content-Length: ' . strlen($jso);
$hdr[] = 'Content-Type: application/json; charset=utf-8';


// MAKE THE CALL
$resp = curl_post('https://securegateplus.nmp.neuroticmedia.net/Customer/Register', $hdr, $jso, 3, TRUE);
var_dump($resp);

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HTH, ~Ray

Thank you, but the result says FAIL

CURL FAIL: https://securegateplus.nmp.neuroticmedia.net/Customer/Register TIMEOUT=3, CURL_ERRNO=52
array(22) {
  ["url"]=>
  string(62) "https://securegateplus.nmp.neuroticmedia.net/Customer/Register"
  ["content_type"]=>
  NULL
  ["http_code"]=>
  int(0)
  ["header_size"]=>
  int(0)
  ["request_size"]=>
  int(624)
  ["filetime"]=>
  int(-1)
  ["ssl_verify_result"]=>
  int(0)
  ["redirect_count"]=>
  int(0)
  ["total_time"]=>
  float(0.123081)
  ["namelookup_time"]=>
  float(0.002697)
  ["connect_time"]=>
  float(0.019398)
  ["pretransfer_time"]=>
  float(0.100394)
  ["size_upload"]=>
  float(461)
  ["size_download"]=>
  float(0)
  ["speed_download"]=>
  float(0)
  ["speed_upload"]=>
  float(3745)
  ["download_content_length"]=>
  float(-1)
  ["upload_content_length"]=>
  float(461)
  ["starttransfer_time"]=>
  float(0.123016)
  ["redirect_time"]=>
  float(0)
  ["certinfo"]=>
  array(0) {
  }
  ["redirect_url"]=>
  string(0) ""
}
bool(false)

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The other solutions were on track, but they did not work. The above solution is tested and works.

The fact that the other solutions were on track means you should have accepted them as assisted solutions - you only got to where you got to because of the Experts help, so it's only right that you acknolwedge that!!