Receiving invalid credentials at Endpoint

I am working on a Webhook API in Postman.

In Postman, I have entered the username, password, and account code in the Headers. I am then sending the below payload directly to the website’s endpoint:

{
  "email": "myemail@yahoo.com",
  "overwrite": true,
  "fields": {
    "first_name": "John",
    "last_name": "Doe",
    "country": "Chile",
    "mrc_c3": "300.00",
    "mrc_date_c3": "10/16/24"
  }
}

Using the above, I am getting a 200 OK response.

I can log into the website and see the updates.

My problem occurs when I try sending the same payload to a PHP script endpoint.

Within the PHP endpoint, I am able to extract the same payload as above and set each parameter to it’s own PHP variable.

Within the PHP script endpoint, I am manually setting the username, password, and account code.

Back in Postman, I then send just the payload over to the PHP script endpoint.

I am getting a 200 OK response in Postman, but in the body of the response, I am echoing out the status, and I am getting a 401 status, which tells me the login credentials are incorrect.

Here is the PHP script:

<?php
  $payload = json_decode(file_get_contents("php://input"), true);

  $email = $payload["email"];
  $firstName = $payload['fields']['first_name'];
  $lastName = $payload['fields']['last_name'];
  $country = $payload['fields']['country'];
  $mrc_c3 = $payload['fields']['mrc_c3'];
  $mrc_date_c3 = $payload['fields']['mrc_date_c3'];

  $url = "https://original.endpoint.com/";
  $xun = "USERNAME";
  $xpw = "PASSWORD";
  $xac = "ACCOUNT CODE";

  $content="{
    "email": "" . $email . '",
    "overwrite": true,
    "fields": { 
            "first_name": "' . $firstName . '",
            "last_name": "'.$lastName.'",
            "country": "' . $country . '",
            "mrc_c3": "' . $mrc_c3 . '",
            "mrc_date_c3": "' . $mrc_date_c3 . '"
        }
   }';
  }';

$curl = curl_init( $url );
curl_setopt( $curl, CURLOPT_HEADER, false );
curl_setopt( $curl, CURLOPT_RETURNTRANSFER, true );
curl_setopt( $curl, CURLOPT_HTTPHEADER, array(
     "Content-type: application/json",
    "USERNAME: $xun",
    "PASSWORD: $xpw",
    "ACCOUNT_CODE: $xac" 
) );
curl_setopt( $curl, CURLOPT_POST, true );
curl_setopt( $curl, CURLOPT_POSTFIELDS, $content );
$json_response = curl_exec( $curl );
$status = curl_getinfo( $curl, CURLINFO_HTTP_CODE );

if ( $status != 200 && $status != 201 ) {
    error_log( "Error: call to URL $url failed with status $status, response $json_response, curl_error " . curl_error( $curl ) . ", curl_errno " . curl_errno( $curl ) );
}

echo "status: " . $status;  // <-- print the status in Postman

curl_close( $curl );

$response = json_decode( $json_response, true );
?>

Let me reiterate that I am getting a 200 OK response from Postman itself, but when I print out the status from within the PHP script, I am getting the 401 response.

Screen shot for reference:

The credentials within the PHP script are indeed correct. So I am not sure why I am getting the 401 response.

Please help.

When I change json_decode to json_encode, I can print_r the payload like this:

print_r($payload);

And it displays in Postman like this:

"{\n \"email\": \"myemail@yahoo.com\",\n \"overwrite\": true,\n \"fields\": {\n \"first_name\": \"John\",\n
\"last_name\": \"Doe\",\n \"country\": \"Chile\",\n \"mrc_c3\": \"300.00\",\n \"mrc_date_c3\": \"10\/16\/24\"\n }\n}"

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