VBA (Access 2013) HTTP POST not passing arguments

I am attempting to get my Access database written in VBA to communicate with a MySQL database on my clients website through a set of PHP web services I wrote. I have managed to get the Access db to retrieve data from the MySQL db but can't get it to post anything. I have narrowed the problem down to the fact that my HTTP request isn't sending the arguments I assign it.

Here are some questions and sites I have looked at already. These were not helpful, because the majority weren't dealing with PHP and were instead looking directly at websites, or were dealing with GET rather than POST.

Http Post not posting data
excel vba http request download data from yahoo finance
VBA HTTP GET request - cookies with colons
Pass Parameters in VBA HTTP Post Request
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How can I send an HTTP POST request to a server from Excel using VBA?
http://www.tushar-mehta.com/publish_train/xl_vba_cases/vba_web_pages_services/
https://stackoverflow.com/questions/29190759/vba-oauth2-authentication-http-get-request
VBA ServerXMLHTTP https request with self signed certificate
How can I send an HTTP POST request to a server from Excel using VBA?
Sending http requests with VBA from Word Sending http requests with VBA from Word

My code for VBA is:

Dim strJSONEncodedJob As String strJSONEncodedJob = "[{""ExpenseID"":""" & astrExpenseIDs(intI) & "}]" URL = "I removed the URL when posting" objHTTP.Open "POST", URL, False objHTTP.setRequestHeader "Content-Type", "application/json" objHTTP.send (strJSONEncodedJob) strResponse = objHTTP.responseText MsgBox strResponse 

And my PHP code is:

// Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } $json = file_get_contents('php://input'); $data = json_decode($json, true); $stmt = $conn->prepare("DELETE FROM tblExpenses WHERE ExpenseID=?"); $txtExpenseID = $data['ExpenseID']; $stmt->bind_param("i", $txtExpenseID); $stmt->execute(); echo '{"result" : "success"}'; $stmt->close(); $conn->close(); 

I get the success statement as a msgbox in VBA, as expected, however the record is not deleted from the MySQL db.

Does anyone have a solution?

Thanks in advance.

Update When I echo $json I get the JSON encoded string, which means the arguments ARE being passed. However, when I echo $data['ExpenseID'] I get a blank msgbox.